Quote:
Originally Posted by Jammer
I'm not familiar with that exact material you said you used to make your caps out of. Is it some kind of light weight plastic? If so I would be on the look-out for the wind blowing them off maybe. But it sounds as if all is going well for you. Are you still getting the 1 1/2 to 2 MPG increase? Because that seems really good.
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It is a corrugated plastic, like a plastic cardboard. I doubt the 1-2mpg increase is accurate, all four are generally 1 to 1.5 mpg.