I don't draft although I'm not knocking the practice. From riding on motorcycles quite a bit I've discovered that unless you are quite close to the vehicle in front there is a tremendous amount of buffeting that occurs as you drop back a reasonable distance behind the front vehicle. I can't imagine how that "dirty air" can give you very good aerodynamics although it seems to work for some. I prefer to be away from all traffic if possible so I can vary my speed a bit and drive my own pace.
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