MustangJunkie said:The gas gauge is highly nonlinear. The first quarter goes slow then it goes faster and faster. The only way to get a reasonable estimate is to finish the tank.
The gauge is nonlinear due to the gas tank, since the fuel level transmitter is most likely linear. Almost all gas tanks are larger at the top, thus showing more miles driven for the first used 1/4 tank of gas.
, this was with about 70% highway driving, about 21.5 mpg.
. I usually get anywhere from 13.2-13.7 in the tank after the light comes on. If we really have a 15.7 gallon fuel cell then our light comes on when there is around 2 gallons left 
