One of our readers @Lamzana asked,
Well, here’s my answer.
I usually only fill up the tank when I’m travelling long distance. When travelling long distance one usually does highway driving. This is generally more fuel efficient than city driving, which is most likely what you will encounter on your way back, when the tank is in the lower half .
Alternatively, when the fuel is in the lower half of the tank, it is likely to move around every time the car stops or goes up/down an incline. This is likely to affect the reading on the fuel gauge. The movement of the gauge changing as you go up or down a hill may give the impression that fuel is being consumed at a greater rate.
Visit How Stuff Works to gain an understanding of how a fuel gauge works.
This however is merely my view, for any thoughts or corrections, leave a comment below.