I've been watching the tank average MPG calculator from time to time, and it had looked pretty consistent. It changes radically when I first gas up, but starts to stablize (not change radically) within a few miles. But last night, with about a little less than 1/2 tank left, I stopped to pick up some dinner. When I started the car again about 20 minutes later, I noticed the Tank Average number started to change radically, jumping all over the place to the point I don't trust the reading it's giving, and it hasn't corrected itself yet.

Has anyone had this happen before? With this many electronics in this hybrid, I wonder if there's a button that keeps "resetting" the tank average calculator constantly that should only be "reset" when I gas up.

Thanks for your help.