I was listening to Click and Clack and they had a caller that wanted to know more about drag and FE. According to them, the greater the speed the more drag on a vehicle. That makes sense to me. Then they said that 40mph is the best speed because drag is not that big a factor at that speed. What I want to know is if drag is an exponential phenomena... does it increase exponentially with speed or is it a straight line inverse relationship? If it is exponential, at what point does speed yield diminishing returns? When it comes to aerodynamics I know only what I've read here. I know that someone here can school me a bit on the subject!
dogncatboy 
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