Alright, so i pretty much never know exactly how much fuel I have! it fluctuates an incredible amount, I dont know if the fuel gauge is somehow connected to the MPG, but lets say i step on it for a bit, then it goes down like a full line. Now I go back to normal driving and I goes back up to where it was. So I really dont know how much fuel i have, and im averaging horrible mileage but thats another story all together, 15 MPG.

 

I think it is all tied to give the normal driver a sense of their range. Honestly, if you figure out the range system that the car uses, that can be much more accurate than using the gas gauge. Gas gauge is simpler to figure out though. You'll get used to it.

 

The fuel gauge shouldn't be moving that much. It should not be moving just based on single inputs from you over a period of seconds. Somethings wrong

 

I average 15 MPG too. Depends how heavy your foot is...