Omega Owners Forum

Chat Area => General Car Chat => Topic started by: STEMO on 06 September 2017, 19:23:56

Title: Fuel computer is a massive liar
Post by: STEMO on 06 September 2017, 19:23:56
On my new astra. Computer is telling me 41.8, brim to brim is telling me 36.9. That's quite a big fib.
Title: Re: Fuel computer is a massive liar
Post by: zirk on 06 September 2017, 19:54:50
Best to do it over a few fill ups, ie, dont reset the computer and keep track on your average fill ups.

Ive always found the Vauxhall MID type ones to on par with the actual, except (in my experience) the NCDC + GID/CIDs which Ive found can be far amount out normally reading a lot higher than actual.
Title: Re: Fuel computer is a massive liar
Post by: 2boxerdogs on 06 September 2017, 20:28:57
My old Omega was spot on with the MPG computer the Merc is also very accurate, I would also advise to gauge it over a few fill ups.
Title: Re: Fuel computer is a massive liar
Post by: Migv6 le Frog Fan on 06 September 2017, 20:39:19
Should have bought an Omega. If its doing 17mpg, the fuel computer will tell you its doing 17mpg.  :y :y
Title: Re: Fuel computer is a massive liar
Post by: Doctor Gollum on 06 September 2017, 20:52:20
Should have bought an Omega. If its doing 17mpg, the fuel computer will tell you its doing 17mpg. And incessantly remind you to fill up every 221 miles  :y :y
You're not wrong ;D
Title: Re: Fuel computer is a massive liar
Post by: Field Marshal Dr. Opti on 07 September 2017, 11:28:23
On my new astra. Computer is telling me 41.8, brim to brim is telling me 36.9. That's quite a big fib.

Manufacturers like to be optimistic. :y

Drove the XFR down to Watford yesterday using mainly the A1 and M1.

Trip computer shows 30.6 MPG. :)

Title: Re: Fuel computer is a massive liar
Post by: TheBoy on 07 September 2017, 13:03:39
I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.
Title: Re: Fuel computer is a massive liar
Post by: Field Marshal Dr. Opti on 07 September 2017, 13:09:56
I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
Title: Re: Fuel computer is a massive liar
Post by: TheBoy on 07 September 2017, 13:23:36
I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
Its an auto though (or did I dream that), and the engine ain't nowhere near big enough for anything other than manual.
Title: Re: Fuel computer is a massive liar
Post by: tunnie on 07 September 2017, 13:42:48
Can't say I've seen 30's average ever out of the VW, but then again it's used for work and long runs up north. So always gets  a good long run.

However even leaving work, in stop start traffic fighting my way through to either the M3 or M25 it will still average 40.something average.

But then again mine is a manual
Title: Re: Fuel computer is a massive liar
Post by: STEMO on 07 September 2017, 15:16:31
I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
Its an auto though (or did I dream that), and the engine ain't nowhere near big enough for anything other than manual.
The engine is plenty big enough. FFS, they put an auto box on a weedy 1.6 petrol. A 2.0 diesel handles it nicely.
Title: Re: Fuel computer is a massive liar
Post by: tunnie on 07 September 2017, 15:59:26
I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
Its an auto though (or did I dream that), and the engine ain't nowhere near big enough for anything other than manual.
The engine is plenty big enough. FFS, they put an auto box on a weedy 1.6 petrol. A 2.0 diesel handles it nicely.

The put an Auto on the 1.4 Zaf Tourer  :D

2.0 diesel in any modern form is quite punchy and quick enough for most normal folk  :)
Title: Re: Fuel computer is a massive liar
Post by: 2boxerdogs on 07 September 2017, 16:37:02
Is that mainly town/short journey mileage? If not it's awful get 27-33 from my Merc.
Title: Re: Fuel computer is a massive liar
Post by: STEMO on 07 September 2017, 16:47:57
Is that mainly town/short journey mileage? If not it's awful get 27-33 from my Merc.
Yes, mainly town driving.
Title: Re: Fuel computer is a massive liar
Post by: Viral_Jim on 07 September 2017, 17:07:30
Not bad then tbh. Autos in general at naff in town (dsg being the exception). 35 is probably about what the Volvo gets in town, which is why I never use it there  ;D. The trip computer thing is odd though. Is there any way to adjust/recalibrate it?  :-\
Title: Re: Fuel computer is a massive liar
Post by: STEMO on 07 September 2017, 18:02:51
Not bad then tbh. Autos in general at naff in town (dsg being the exception). 35 is probably about what the Volvo gets in town, which is why I never use it there  ;D. The trip computer thing is odd though. Is there any way to adjust/recalibrate it?  :-\
Don't know, Jimmy, but as it's the first and last time I'll bother looking, it really doesn't matter.  ;D
Title: Re: Fuel computer is a massive liar
Post by: BazaJT on 07 September 2017, 19:01:20
I found the read out of the Senator and the Omega to be pretty much accurate and the V70's while not as accurate is pretty much there or thereabouts.
Title: Re: Fuel computer is a massive liar
Post by: Rods2 on 07 September 2017, 19:59:15
Let Tunnie drive it for a week he will get at least 104mpg, driving it in his normal like I stole it style. ;D ;D ;D
Title: Re: Fuel computer is a massive liar
Post by: plym ian on 07 September 2017, 23:06:21
I get around 30mpg around town and about 45-50 on a long run in the insignia tourer 2.0 diesel and its manual to.
Title: Re: Fuel computer is a massive liar
Post by: Sir Tigger KC on 08 September 2017, 09:18:00
On my new astra. Computer is telling me 41.8, brim to brim is telling me 36.9. That's quite a big fib.

I knew you'd be back moaning about the fuel economy.  Next you'll on about the road tax!  ::)

If you'd bought the black one....  :P  ;D
Title: Re: Fuel computer is a massive liar
Post by: Rods2 on 08 September 2017, 18:16:47
Must be filling up at your local Scouser Service Station where you get a US gallon and pay for a UK one. ::) ::) ::)

41.8 / 4.546 x 3.785 = 35.5 so not so far out after all. ;D ;D ;D