Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: omega3.0mv6 on 15 June 2010, 17:21:28

Title: fuel consumption
Post by: omega3.0mv6 on 15 June 2010, 17:21:28
hi i am sorry to bother u all but i was wondering could i have a bit on insite to what a 3.0 auto omega is ment to do on a full tank of fuel i do understand most are diffrent cos of all diffrent driving habbits i would like to hear what u all get and how u drive

thanks
Title: Re: fuel consumption
Post by: Lizzie_Zoom on 15 June 2010, 17:28:54
Well if it is motorway driving you can get to around 34/35 mpg top end. 

Around town you are lucky to see 19 mpg, and on average I see about 21 mpg.

So with a tank holding 75 litres you can work out the average range you will get.

Oh yes, and I am a fast driver using the S mode & box to the full! 8-) 8-) 8-)
Title: Re: fuel consumption
Post by: maximoke on 15 June 2010, 17:53:24
You get 21mpg with Smode ON and your foot planted!  Thats pretty good!
Title: Re: fuel consumption
Post by: Lizzie_Zoom on 15 June 2010, 18:18:49
Quote
You get 21mpg with Smode ON and your foot planted!  Thats pretty good!


In town though I do use the accelerator economically, in others words when I accelerate I try to make the most out of that burst of energy before using my brakes, and always obeying the speed limits.

On motorways and out of town roads then I use the car to the full ;) ;) ;)
Title: Re: fuel consumption
Post by: Mikes1670 on 15 June 2010, 18:34:21
According to my on board computer I get 21.5 mpg commuting to work (mainly town driving). However, when I calculate my mpg based on odometer mileage and fuel used (from last full tank to re-fill amount in litres) it works out at between 18 to 19 mpg so dont trust your on board computer to be exact  :P. On a motorway run I have achieved 30mpg (calculated). But like you say driving styles will come into it. I don't think it's worth having the power if you're not going to use it.  :y
Title: Re: fuel consumption
Post by: elite col on 15 June 2010, 19:22:37
mine took 40litres to do 300miles on motorway

birmingham-edinburgh

i think i get around 85-90 miles to £20 of fuel around town
Title: Re: fuel consumption
Post by: Brikhead on 15 June 2010, 19:40:17
Quote
Around town I see about 21 mpg... and I am a fast driver using the S mode & box to the full! 8-) 8-) 8-)

The trip computer in my 3.0 auto saloon is currently showing 18.5 m.p.g. but I only normally do very short runs so the car never really warms up properly, as soon as the temperature gauge hits half way though I tend to drive every where with the rear end squirming and my foot buried deep in the carpet!
Title: Re: fuel consumption
Post by: omega3.0mv6 on 15 June 2010, 20:35:11
i believe theres alot of heavy footing going around lol i think im getting simular miles but i do tend u put my foot down abit but i took my car to have the emission test and it fail the test aswell but i cant say i notice on the fuel i donr surpose anyone knows why the emissions would fail ?

take care 
Title: Re: fuel consumption
Post by: duggs on 15 June 2010, 21:33:03
I drive fairly "Grandpa" like and have NEVER had less than 25 mpg on average, on a 50/50 combination of dual carriageway and around town.

I've always ensured the breathers are clean AND had EVERY gasket and ring replaced a while back.

That said and I'm sorry to any doubters out there...but as with every car I've ever owned I've used Slick 50 in her, and every car I've ever owned has always appeared to give me better fuel economy that expected. Either that or i'm more of a Grandpa than i thought ??
Title: Re: fuel consumption
Post by: sjc on 16 June 2010, 11:17:26
Quote
According to my on board computer I get 21.5 mpg commuting to work (mainly town driving). However, when I calculate my mpg based on odometer mileage and fuel used (from last full tank to re-fill amount in litres) it works out at between 18 to 19 mpg so dont trust your on board computer to be exact  :P. On a motorway run I have achieved 30mpg (calculated). But like you say driving styles will come into it. I don't think it's worth having the power if you're not going to use it.  :y
You're injectors need cleaning then.

The fuel computer uses the injector duration to work out the fuel used.  It should be very accurate and if yours isn't then the injectors are letting in more fuel than they should - which will be caught by the lambda but only after it has happened.  Also, lambda is ignored under acceleration (except if very mild).
Title: Re: fuel consumption
Post by: sjc on 16 June 2010, 11:21:07
Quote
i believe theres alot of heavy footing going around lol i think im getting simular miles but i do tend u put my foot down abit but i took my car to have the emission test and it fail the test aswell but i cant say i notice on the fuel i donr surpose anyone knows why the emissions would fail ?

take care 

Most likely faulty lambda sensors but could also be cats or leaking exhaust.  I'd have thought your emissions tester would be able to point you in the right direction.
Title: Re: fuel consumption
Post by: Sixstring on 16 June 2010, 11:57:05
Min 480, max 500 miles to a 3.0 estate tank on motorway miles, 380-400 if mostly town miles.

(don't drive like Miss Daisy.........)


Mike.
Title: Re: fuel consumption
Post by: Mikes1670 on 16 June 2010, 17:38:24
Dirty injectors :-[ What's the best (easiest) way to clean my injectors then? Any recommendations?  :y
Title: Re: fuel consumption
Post by: Shrek on 16 June 2010, 17:50:58
Min 480, max 500 miles to a 3.0 estate tank

The best i have ever seen in my 2.2 petrol was 37 mpg and that was driving like a fairy on a motorway run ... i got 420 miles out of that tank .
I know the 2.2 is not the most economical  :-/
I wish i could get 500 miles from a tank and yours is a 3 ltr .
 :-/ :-/
Title: Re: fuel consumption
Post by: sjc on 16 June 2010, 18:59:12
Quote
Dirty injectors :-[ What's the best (easiest) way to clean my injectors then? Any recommendations?  :y

You can try the stuff you add to the petrol but the only way I've found that really works is to have them cleaned ultrasonically - that way they get tested too.

Some places do an exchange scheme where they send you cleaned injectors and you pay a deposit that is refunded when you return your dirty ones.  The idea being you're not without the car while they're being cleaned.  Or buy a spare set and send them away.

What's your mileage?
Title: Re: fuel consumption
Post by: tunnie on 16 June 2010, 19:05:56
Quote
Min 480, max 500 miles to a 3.0 estate tank on motorway miles, 380-400 if mostly town miles.

(don't drive like Miss Daisy.........)


Mike.

Don't believe that for a second!
Title: Re: fuel consumption
Post by: hercules on 16 June 2010, 19:09:16
Quote
Min 480, max 500 miles to a 3.0 estate tank

The best i have ever seen in my 2.2 petrol was 37 mpg and that was driving like a fairy on a motorway run ... i got 420 miles out of that tank .
I know the 2.2 is not the most economical  :-/
I wish i could get 500 miles from a tank and yours is a 3 ltr .
 :-/ :-/
most uneconomical car i ever owned
Title: Re: fuel consumption
Post by: tunnie on 16 June 2010, 19:13:38
Quote
Quote
Min 480, max 500 miles to a 3.0 estate tank

The best i have ever seen in my 2.2 petrol was 37 mpg and that was driving like a fairy on a motorway run ... i got 420 miles out of that tank .
I know the 2.2 is not the most economical  :-/
I wish i could get 500 miles from a tank and yours is a 3 ltr .
 :-/ :-/
most uneconomical car i ever owned

constant 30-34mpg average over course of 4 years, can't complain here, rather do that and get 38mpg in some crappy FWD hatch
Title: Re: fuel consumption
Post by: sjc on 16 June 2010, 19:16:13
Quote
Quote
Min 480, max 500 miles to a 3.0 estate tank

The best i have ever seen in my 2.2 petrol was 37 mpg and that was driving like a fairy on a motorway run ... i got 420 miles out of that tank .
I know the 2.2 is not the most economical  :-/
I wish i could get 500 miles from a tank and yours is a 3 ltr .
 :-/ :-/
most uneconomical car i ever owned

Try running a BMW 540i then.  My normal commute in the Carlton 24v GSi would get about 31-32mpg being frugal, or 27-28 if givin it some.  In the BM I used to get 22mpg bring frugal and 17 if not.

I get about 28 in the MV6 auto regardless  :-?

And about 32-33 in the manual if gentle on the gas or 28-29 if heavy.
Title: Re: fuel consumption
Post by: hercules on 16 June 2010, 19:16:46
Quote
Quote
Quote
Min 480, max 500 miles to a 3.0 estate tank

The best i have ever seen in my 2.2 petrol was 37 mpg and that was driving like a fairy on a motorway run ... i got 420 miles out of that tank .
I know the 2.2 is not the most economical  :-/
I wish i could get 500 miles from a tank and yours is a 3 ltr .
 :-/ :-/
most uneconomical car i ever owned

constant 30-34mpg average over course of 4 years, can't complain here, rather do that and get 38mpg in some crappy FWD hatch
i agree tunnie if yer gonna get shit mpg do it in style and comfort..but iirc most of your miles are motorway commuting so you will see alot better mpg than most
Title: Re: fuel consumption
Post by: sjc on 16 June 2010, 19:19:58
Oh, and BTW, 1998 E39 540i = 4.4L V8 (285bhp/324lbft) so it's maybe not surprising it drank fuel.
Title: Re: fuel consumption
Post by: tunnie on 16 June 2010, 19:22:30
Quote
Quote
Quote
Quote
Min 480, max 500 miles to a 3.0 estate tank

The best i have ever seen in my 2.2 petrol was 37 mpg and that was driving like a fairy on a motorway run ... i got 420 miles out of that tank .
I know the 2.2 is not the most economical  :-/
I wish i could get 500 miles from a tank and yours is a 3 ltr .
 :-/ :-/
most uneconomical car i ever owned

constant 30-34mpg average over course of 4 years, can't complain here, rather do that and get 38mpg in some crappy FWD hatch
i agree tunnie if yer gonna get shit mpg do it in style and comfort..but iirc most of your miles are motorway commuting so you will see alot better mpg than most

Used to get 30mpg average on my 10 mile commute that i did for 2 years, i don't find Omega consumption that bad
Title: Re: fuel consumption
Post by: omega3.0mv6 on 16 June 2010, 21:42:09
well i filled up my tank and im just under the 20 ltr mark and clocked 313 so far and that is mostly motorway and i dont drive mad and keep it at 70 most of the time ?
Title: Re: fuel consumption
Post by: sport on 16 June 2010, 22:46:47
Hi i have been told when engine at temp, put computer on instant con it should read .2 if reading .3 its running rich .Make sure lights and heater is of
I get 19 to 27 around town motorway keeping speed about 65 to 70 mph i get 36 mpg, and thats withe a roof box on.
Put computer on instant and put your fut down then i get 7 mpg
Title: Re: fuel consumption
Post by: omega3.0mv6 on 16 June 2010, 22:47:58
hi ok i didnt know that il have a look

thanks  :y
Title: Re: fuel consumption
Post by: serek on 16 June 2010, 22:54:53
Quote
Oh, and BTW, 1998 E39 540i = 4.4L V8 (285bhp/324lbft) so it's maybe not surprising it drank fuel.
think to get one of them :) 6 speed manual 8-)
Title: Re: fuel consumption
Post by: Andy B on 16 June 2010, 22:54:59
Quote
...
 i have been told when engine at temp, put computer on instant con it should read .2 if reading .3 its running rich ....

I'm not checking now, but IIRC mine normally ticks over at 0.3 gals/min as did my Senator.  :-/
Title: Re: fuel consumption
Post by: CaptainZok on 16 June 2010, 22:56:15
Quote
Quote
...
 i have been told when engine at temp, put computer on instant con it should read .2 if reading .3 its running rich ....

I'm not checking now, but IIRC mine normally ticks over at 0.3 gals/min as did my Senator.  :-/
Depends if you've got the aircon running too.
Title: Re: fuel consumption
Post by: serek on 16 June 2010, 22:56:24
Quote
Quote
...
 i have been told when engine at temp, put computer on instant con it should read .2 if reading .3 its running rich ....

I'm not checking now, but IIRC mine normally ticks over at 0.3 gals/min as did my Senator.  :-/
its with A/C on or off ???
Title: Re: fuel consumption
Post by: Andy B on 16 June 2010, 23:01:14
Quote
Quote
Quote
...
 i have been told when engine at temp, put computer on instant con it should read .2 if reading .3 its running rich ....

I'm not checking now, but IIRC mine normally ticks over at 0.3 gals/min as did my Senator.  :-/
its with A/C on or off ???

A/C is almost always on 'auto' so it must be when it's ON
I'll take more notice next week when I use it everyday in sunny French France and report back  ::)  ::)
Title: Re: fuel consumption
Post by: omega3.0mv6 on 16 June 2010, 23:08:03
i dont mean to sound thik i got air con but i dont know how to turn it on there is an eco button what does that do a light comes on when pressed but nothing happens

thanks 
Title: Re: fuel consumption
Post by: Andy B on 16 June 2010, 23:14:16
Quote
i dont mean to sound thik i got air con but i dont know how to turn it on there is an eco button what does that do a light comes on when pressed but nothing happens

thanks 

Assuming all is as it should be, it knocks the a/c compressor off, which in effect reverts your car to a car without air conditioning. It would still heat if required,but obviously not cool to below outside air temp.  :y
you could read the manual  ::)  ::)  ::)

When you press 'AUTO', you've turned your air con on (does it still have enough gas in there? ;))
Title: Re: fuel consumption
Post by: CaptainZok on 16 June 2010, 23:16:13
Does nowt when I press mine either. :(







Must get TG to ask his boss how much for a regas.
Title: Re: fuel consumption
Post by: omega3.0mv6 on 16 June 2010, 23:29:33
i was told ages ago when u switch on aircon the rev counter drops a tad putting more strain on the engine is that correct

thanks
Title: Re: fuel consumption
Post by: CaptainZok on 16 June 2010, 23:31:16
Quote
i was told ages ago when u switch on aircon the rev counter drops a tad putting more strain on the engine is that correct

thanks

No the ECU should speed up tick over to compensate for the compressor load.
Title: Re: fuel consumption
Post by: omega3.0mv6 on 16 June 2010, 23:39:44
oh right ok i just read in the manual regards to the eco it says when the aircon is in auto mode u press the eco to save on fuel ?
Title: Re: fuel consumption
Post by: CaptainZok on 16 June 2010, 23:53:21
When you press eco it switches off the compressor, which takes a load off the engine and saves fuel, but you don't have aircon.
Title: Re: fuel consumption
Post by: sjc on 17 June 2010, 06:44:43
Quote
Quote
Oh, and BTW, 1998 E39 540i = 4.4L V8 (285bhp/324lbft) so it's maybe not surprising it drank fuel.
think to get one of them :) 6 speed manual 8-)
Hhmmm... lovely!  Mind you, you can get an M5 from the same series for not much more these days!
Title: Re: fuel consumption
Post by: sjc on 17 June 2010, 06:49:54
Quote
Quote
i was told ages ago when u switch on aircon the rev counter drops a tad putting more strain on the engine is that correct

thanks

No the ECU should speed up tick over to compensate for the compressor load.

Yep, and if it's auto you have to hold it back more on the brakes at junctions cos the extra revs make it want to "creep" quite a bit more.  If find that a pain in the neck when trying to manouver into thight spaces.
Title: Re: fuel consumption
Post by: Kaycee on 17 June 2010, 07:37:24
well to add my twopennorth i get 32 on my hemel run from doncaster and back once a month and knocking about doncaster 25 im well pleased with mine better than the 2.5 i had and thats with the oil leak at the front i have to put up with but seriously its the best car ive had for fuel consuption and its a 3.2 but if we buy these cars we have to accept that the lovely and serene drive and the rush of power when needed as to be paid for
Title: Re: fuel consumption
Post by: duggs on 17 June 2010, 13:10:51
AND a price well worth paying as far as I'm concerned.
Mind you, at 40p per mile business use, fuel wise, it doesn't really cost me a penny. :y :y :y
Title: Re: fuel consumption
Post by: Sixstring on 17 June 2010, 14:01:45
Lucky you!!! I only get 20p per mile, just breaks even if I'm a bit light on the throttle, or on mototrways a lot. :-[
Title: Re: fuel consumption
Post by: sjc on 17 June 2010, 14:15:18
Quote
Lucky you!!! I only get 20p per mile, just breaks even if I'm a bit light on the throttle, or on mototrways a lot. :-[
That's pants, tell them you want more or the company will need to provide transport.  You're allowed up to 40p/mile before you can be taxed, or 45p/mile if you have one or more passengers.

40p doesn't really cover the true running costs of even the most frugal of cars - not when you add up insurance, tax, mot, tyres, servicing & repairs and fuel.
Title: Re: fuel consumption
Post by: Mikes1670 on 18 June 2010, 17:07:53
Just turned 28,000 miles (with full history). Has anyone else every done the calculation to check the accuracy of the on board computer. Method to clarify calc. Fill tank to full - reset odometer & onboard computer - run to almost empty - refill tank to full - record litres to refill - record odometer mileage - divide litres by 4.5 to convert to gallons - divide mileage covered by gallons to get mpg then compare with on board computer.

Title: Re: fuel consumption
Post by: Road Hog Mad on 18 June 2010, 17:29:24
hmm... 16MPG stop start town work, i.e. Manchester, changes gear before 2,000 revs in an 3.0 MV6 Auto.

16MPG = Shite!

I am tempted to try that injector cleaner stuff but I doubt it works lol
Title: Re: fuel consumption
Post by: karlc on 18 June 2010, 17:47:25
only get about 20mpg out of my 3.2 but thats anaverage lpg calling!!!
Title: Re: fuel consumption
Post by: Road Hog Mad on 18 June 2010, 17:49:09
It must be the way you or I drive them.

My Dad drives like the manager of mattress company and he always returns a better MPG than me and I have done advanced motoring courses and various other drivel.