This is a problem I notice on my Nissan Maxima and on my former car, Toyota Camry. When I fill the car, the gas level goes about 1/8 above the full line. The car goes almost 100 miles until the first quarter is used. The next quarter goes about 75 miles (total mile 175). The third quarter seems to go only about 60 miles and the final quarter is on empty within 50 miles.
First, why does the gauge go over the full gauge at the beginning? Why doesn’t it stop at full? Perhaps, this accounts for why I get 100 miles during the first quarter as I really have an extra 1/8 tank but then, why does the gauge depletion seem to accelerate and the second half yields fewer miles then the first half and the third quarter fewer mile than the fourth?