Originally Posted by sgoldste01
It's not that your car is consuming more gas when you get down to the last 1/4 tank. It's that the tank is tapered on the bottom, so the bottom portion of the tank holds less volume that the upper portions of the tank. It has nothing to do with momentum, weight, consumption of gas, and so on.
And the main reason many people fill their tanks at around the 50% point is to avoid the accumulation of condensation in the tank. This is most important in the winter time.
Are you saying that a half full tank is not actually half full according to volume? But half way up the tank? That can't be right. Even given the shape & the sediment, etc. that's another topic & another reason to not wait until your tank is low to fill up. But that can't be the case. 1/2 full should be 1/2 by volume. How else would you define half?