@SeaFury I used to have to drive a lot for work...never noticed a difference as far as how much fuel the tank holds.

What *did* change my fuel consumption was the stuff that people always tell you: Don't drive angry, don't slam on the gas or the brakes.

One of my jobs was 150 miles away and I managed to save a LOT of gas on that regular trip by changing to the lane that would give me the shortest path (on the freeway, for example, if the road turned to the right, being in the right-hand lane is a shorter path than being in the left, and vice versa)