I would like fuel economy to calculate off of the GPS Trip Log.

First of all, this app is great! I love it and it is very useful to keep track of car expenses across multiple vehicles. I am genuinely surprised it is a free app and not a $10 one off buy or similar.

My suggestion is I would like the option for fuel economy to be calculated off of GPS distance from the automatic Trip Logs. I would also like the option for fuel economy to be applied backwards to between the last time the tank was filled and now.

My car is a 4wd with over-sized tires. I know from experience that when my speedometer in the car reads 100km/hr, I am actually traveling at 107km/hr based off of GPS speed. Going by this then, if I fill my 60lt tank after 450km based on the car odometer reading, the fuel economy looks like 60/4.5 = 13.3 litres per 100km. But if I calculate economy off of GPS distance it is actually 60lt per 481.5km 60/4.815 = 12.46 litres per 100km.

Odometer Distance 13.3 litres / 100km vs GPS Distance 12.46 litres / 100km.

That is almost a 1 litre per 100km improved economy and is actually more accurate.

This isn't so much a big deal when city driving, but when out on 4wd tracks, I am often gone out for 2 or 3 days at a time. On tough trips I drive in low range so the fuel usage is a lot more. And my my tires are slipping in mud, or sand or on other loose surfaces which in this case, the odometer reading may show I have travelled a lot further than the GPS distance.

In this case, having the GPS distance calculate fuel economy is also much more accurate. It would also be more beneficial when I fill up next to be able to apply the GPS calculated fuel economy to all the trips I made between the last full tank and now when I fill up.

I know these are very specific details and requests compared to what most users are suggesting but if it could happen this would be amazing.

Thanks.