what I have done in the past is fill a 2 gallon jerry can and drive it until it is completely out of gas. then take a mental note of how many miles you got out of that tank of gas, and then you have a better idea of how far you could go on a full tank. don't always bet on it being the same every time, driving habits will change the amounts.
I drove my gti until the needle was below empty, I was scared I was going to run dry.had a small jerry can with me. when I filled up with gas, it only took 31 liters.(441 km) tank holds 40.

I could take the dash apart to remedy the problem, but the way it is it gives me a reserve if I need it. I could get 500km per tank, but that is pushing my luck

or I would be pushing my car
