That was a good read.
Quote:
Put air deflectors in front of your tires. Make them out of conveyor belt. Also make a conveyor belt air dam. You can drag it offroad and you won’t tear it up, but it will improve your fuel economy and improve your onroad handling.
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Not only for off-road, but also for highway speeds, cinch that air dam down really tight.
This example is inflexible, for a different environment; but look at the dozen screws (under pan washers) holding that on. Granted they are at higher speeds, but (seriously) it's a Beetle—how fast could it go?
They said they had to take it off to get the car on a trailer.
If the conveyor belting is held with L-brackets, make each one a little quarter-elliptic spring, stiff enough to resist the air at speed, but flexible to take abuse off-road.