You might try decreasing the aero drag. You can reduce the front ride height about 1 to 2 inches lower than the back. Or try making a front spoiler that will go down from the front pannel about one to 2 inches. If your back bumper can act as a "cow catcher" type air drag....put a level pannel from it's lower edge on towards the front of the car and try to keep air out of the area. You can make a small wind splitter in front of the rear tires (runs vertically and pushes air around the tire) that is not too visible....helps air to flow around the rear tires. Then wax that car to the hilt. Waxing and polishing is supposedly good for 1/2 to 1 mpg on the average car. Use rain-x or a product for the glass from "For my Mercedes. c o m"....leave out the spaces. Jerry's stuff really cuts the friction on the window glass....your windows will go up and down faster on those cars with really tight side glass seals as proof....stopped a window squeek on raising/lowering that way. His pollimer wax is good stuff as well.

Studies undertaken during gas crisis one (1972) showed that the side mirrors on cars was responsible for about 1/2 to 1 mpg decrease per car.....and the govt. tried to figure a way for rear viewing without the mirrors, but nothing ever came of it. Today, the same study might result in small tv. cameras and a interior view screen instead of the side mirrors. Pougeot did an aero experiment using simple tricks such as these and that car did not look too far from the average car, and got the aero down less than 30. Audi paid attention and then their flush side windows of the early 80's came about. The railroad cross tie bumpers on American cars of the 70/80's really hurt aero....in that they overhung the body on the sides. Those styles have pretty much gone away-even on the SUV/trucklets.

Regards

Run-em