Has anyone tried and did a comparision of MPG on the different grades of gas; Regular, Mid-Grade Special and Premium. I know the manual says for best performance use the Premium, but at 20+ cents a gallon more I'm not sure it would be worth it.

2005 Prius - White, Gray Interior, Option Package 6, Mud Flaps & Auto Door locks from Coastal


2006 Highlander Hybrid - Limited, White, Tan Interior, Nav, 4WD, Trailer Hitch

NOTE: On both the Prius and HH batteries are included with your purchase !