Drafting
I draft whenever I can. I drive a Ford Ranger (not very areo so it benefits more) and as you creep up behind a semi, I find that the my truck will start to get buffeted around even over 150 feet back. Once I creep up through that the scangauge will show improvements. 10-20% is easy and still remain a safe stopping distance behind. Yes I can outstop the semi, so I am not worried about that, but semi's have habits about kicking up road debris, which you do not have time to dodge (I have a nasty windshield to show for it - one incident in many years of drafting). Works best behind a fast moving truck with two 'box' trailers and without a crosswind. I can stay far enough back to see a side mirror on the truck ahead and still benefit. 150 feet or so.
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