I drafted every big rig I could when I was driving Ron Burgundy out on I-4 every day between Tampa and Orlando.
I can tell you from experience that I was normally way over a hundred feet behind the semis and still in the bubble. I never had to get into what I would consider an unsafe distance to get the extra mpg boost, so I hung back at the furthest distance that would give me the higher mpg on my instant mpg meter.
Worst part of drafting the big boys was the amount of pebbles, etc . . that kept
taking paint off the front of the car. And occasionally I had to dodge something in the road that the trucks could drive right over
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