The car feels like the tach is off by 1000 rpm. At 2000 rpm you have the power that was available at 3000 rpm and so on.Suddenly I feel the need for a taller drive gear as the car has so much power at highway speed. It is smooth as silk from idle all the way to red line. It does have a nice growl at high rpms though.My gas mileage did improve when I am not on it. I just got 23.75 mpg on a 60/40 highway/city tank of gas. An improvement of 1.5 mpg. Not a bad deal.