the best way I found to gauge distance is watch as the debris , leaves etc, get carried along in the trucks wake, if your there your good, can be a pretty fair distance, also someone mentioned buffeting another good indicator , roll down your window and when you feel the air popping in and out of the car ,I think your drafting . either way you've got to stay glued to his brake lights for reference, and if he should crash, you do too. most likely. probably works better on a pickup than anything, I've actually felt gains when someone tailgates me with the right shaped car, can't remember what kind but it happens.
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