I like the big Fed Ex trucks that go way low to the ground. Those are the only ones I find usefull for any drafting purposes. I feel it at about 50' at about 60mph. At 80mph i'll be about 100' and still feel the effect. I only do this if im on the interstate and in a hurry.
The drafting effect isn't as good as slowing down. So I mostly just drive slow and let everyone pass me.
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