If you have put £10 worth of standard unleaded into your car, I'm estimating that it cost around £.90 per litre, then you have put in 11.1 litres of fuel. This is equivalent to 2.4gallons of petrol. 34 divided by 2.4 = 14.1. This is a rough estimate of your miles per gallon (as far as I can tell). I may be drastically wrong but this I how I would work it out. Better to do it will a full tank and measure it from when your light comes on.
If this reading is anywhere close to being true, and you don't drive a V12 monster, you have a leak in your fuel lines. Either that or you are taking the piss. |