I hear ya. This last weekend I made a trip over the Sierra range (8,000ft) down into Mono Lake basin (6,378ft.) then up into Tioga Pass (9,943ft.) and through Yosemite then back home on one tank. With 70-75mph speeds (on the major highways) and the AC set at 76F I ended the trip with something like 52mpg calculated. When I went to refill the pump kept clicking off so I'm not sure how full I got the tank. Rather than run that tank out and ruin my error reporting data I drove for about 72miles the refilled normally. Either way my fuelly is screwed because of the Yosemite trip but I had fun and my girlfriend was happy I was not trying to hypermile.