When I have 100 + mi day, I end up driving on gas for a while. My car computer is telling me I'm getting 50-55mpg. I get ethonol free gas every chance I get. I was doing that a few yeas ago with my Prius and I did see about 4mpg different. It was worth it and easy to calculate. Anybody else seeing those # on trip calculator? Anybody else using the better gas?