I have found that if I run by the tach and keep it at a consistant 2,000 to 2,100 rpms I get the best mileage on the highway with the cruise control on. It translates to around 64 mph for me with stock rubber and 4:10's. I run in the right-hand lane and get a big kick out of the people who race on by only to be sitting at the bottom of the ramp when I roll up behind them. I really believe the 4:10's help in town IF I can keep my right foot under control. :-laf