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[Webby the Bear]

Hi guys,

As above...

My red light had just come on (I'm not Roxanne... I mean my fuel warning light  ) and I filled up to just over half the other day. It cost me £45.21 at £1.369 per litre.

I immediately put the milegae button back to zero and am calculating what I'm using.

HOWEVER, am I right in thinking that even when there's no range left there is still a certain amount of fuel left? If so any idea what this is?

Just want to work out as best I can the MPG manually 

[albitz]

Only one way to do it accurately.Fill the tank to the brim,drive around for xyz number of miles.Then fill it up  again.And if you want to be scientifically accurate,fill it up at the same pump again.
The old chesnut - xyz number of miles from  £30 (for example) of petrol is so innaccurate its not worth the bother of working out the figures.

[Webby the Bear]

i see albs.... thanks for that. that makes perfect sense.

filling up from the same pump though?  lol

i dont suppose it matters but as long as my comparison is equal. but at what point is the tank brimmed? if i ever fill up to what i call the brim i go to the first click 

[albitz]

From the same pump the ground the car is stood on will be equally level (or not) when its filled so the pump should click off after dispensing the same amount each time.Thats taking things a bit far imo though.
First click is the thing to do imo.I have read (not sure how true though) that when you go past that the petrol goes back down the second pipe attached to the nozzle and into the garage tanks.Could well be an old wives tale.

[omega3000]

I always watch the the wheel arch sag when topping up , not that it sags much with 20 quid 

[GastronomicKleptomaniac]

I was quite impressed the other week - over a full tank of driving it, erm, "briskly" (including chasing an MX5 across a good chunk of Northumberland), my 3.2 still worked out at 25mpg.

[Field Marshal Dr. Opti]

How accurate is the trip computer?

[Martian]

How accurate is the trip computer?

It's a computation based on average measurements taken over a given time period.

[2boxerdogs]

I always fill mine up when I have done 6 trips to work & back mileage covered is 330 miles always takes 50 litres, (11 gallons) so equals 30mpg computer shows an average of 30.1 so is fairly accurate overall (2.6 CDX manual saloon)

[pauls]

Only one way to do it accurately.Fill the tank to the brim,drive around for xyz number of miles.Then fill it up  again.And if you want to be scientifically accurate,fill it up at the same pump again.
The old chesnut - xyz number of miles from  £30 (for example) of petrol is so innaccurate its not worth the bother of working out the figures.

Can you lend me the money so I can fill it up then

[albitz]

I have never filled the petrol tank of my Omega since the day I bought it. Fill the LPG tank quite often though. 50 litres at 73p isnt too bad.

[tigers_gonads]

Filled my petrol and gas tanks up to the top once.
I couldn't get over the speed bumps down a mates street without scrapeing the exhaust 

[waspy]

Brimming also means carrying extra weight. Extra weight also equals less MPG. Have you ever tried picking up 10 gallon let alone nearly twice that.

[omega3000]

Brimming also means carrying extra weight. Extra weight also equals less MPG. Have you ever tried picking up 10 gallon let alone nearly twice that.

 

[SIR Philbutt]

Going to get some arguments here, but what the heck 

For the last 12 month I have been resetting my trip distance and average MPG on the computer every time I fill up (LPG). Each time I record the trip miles and the avg MPG on the receipt and calculate it later.

The ave mpg is dead on accurate every time as it is displaying the avg mpg for that tank of fuel and the way I drove using it.

If you do not reset the avg mpg each time you fill up you are getting the average for every tank full and the way you have driven since it was last reset. IMO by what I have found, this can cause manual calcs to be slightly different from the computed

I have found a couple of things doing it this way
When I set off from just filling up and the avg mpg being zero'd I drive a little better as initially you will be seeing 9-15 avg mpg 
If you come to a jam or lights fairly quickly you see it going down at tickover, ouch, but it slows down, going down, if you put it in neutral   
I find myself constantly trying to get the new avg mpg up as high as poss all the time, which can only be good 

By the way get 22-23 around town, stop start, short journeys. On the Motorway 35. Cant complain, and wont, it's my mig 

And yes I know there is some petrol usage in there and I dont record it as it is minimal and the results have made me trust the computed results.

Give it a try Mr Bear