Have you ever noticed that you are most likely to lose a bar on the fuel gauge when you are going up hill but you never ever gain one on the way back down? For me, the cuplrit for flaky behavior is hills. Every time I go up a steep hill I pay close attention to see it the reading changes. Often it does. My guess is that going up a hill, the tank sensor detects a lower level due to movement of the fuel to the back of the tank. Usually when that happens, the next bar lasts much longer, unless I have another steep hill. Invariably, I get the ADD FUEL warning while going up a hill. And the one time that I actually ran ran out of gas. Well I'm sure you can guess.

It's a Wonderful Day for Science!