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Everything mentioned here is excellent.
I would add that it is important to keep the air flowing smoothly around the car at highway speeds.
On a wagon, remove the roof rack if you don't need it.
On the highway, it is more efficient to run the A/C than to open the windows.
Restore all the plastic underneath to original. Most important (I have read) is the plastic panel ahead of the rear bumper. After that, the air dam, the engine belly pan, and the radiator-forward pan.
There used to be a guy posting on this board who made a full coverage belly pan for the whole bottom of the car out of plywood. He said that it helped mileage. I would presume that it would help, but would be a bit of a pain.
My '91 5-speed wagon gets around 20 mpg on my daily commute. On freeway trips at 70-75mph, I use a three-tank average to calculate mileage, and the best I can ever get is 29.5 mpg on level terrain with moderate load. I expect that 10mph slower would get me to 30-31 mpg, but I have never had the patience to try it.
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