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It has been my experience that you can get a significant improvement in mileage by driving in the tip of the turbulence wake of a large truck or trailer. Get in close enough to just feel the buffeting. That usually gives a safe buffer, between 2 to not quite 3 seconds, on rural freeway, but just inside the rig's blind spot (with three trailer rigs I can sometimes see the side mirrors). Crosswinds shorten (alter the angle of) the wake, so it would be inadvisable to draft in those conditions. I don't drive closer than 2 seconds behind a semi rig, except in heavy, slower, urban traffic (because some idiot will always fill the gap).
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