MPG calculations

[Toms306]

second method, its most sensical.

Also toms306 is a retard if he thinks you get 0mpg with the car using no fuel and still travelling....
If i knock the car off and travel 3 miles downhill thats 3 free miles, them miles will be infinite but add into rest will give true average mpg reading for tank..

Yes I might be a retard, but you aren't doing any miles PER GALLON as you aren't using any gallons, I don't see how thats difficult to understand tbh.

But in terms of travelling you are doing infinite miles from that gallon as you are never using the fuel. That is how the systems work it out in the car.

For example in your case, every time you coast down a hill in gear thus not using fuel the car average MPG would drop towards 0 MPG, which is obviously not true as your MPG will increase if you can conserve fuel whilst coasting in gear.

Yeah I know thats how these crap cars work it out - hence my Vaux being so inaccurate. This is why the Golf's system is ideal tbh - it goes to '---' when coasting, so it doesn't knock out the average mpg.