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Going about 60 mph, I see something like 3 lbs of boost. At 70, it can get up to 7 or more. If I get behind a semi at about 30 metres, I can see a reduction in boost. But because of the increased effort to try to stay at that distance, I sometimes find myself playing catchup and having to accelerate more than just cruising.
As far as truck drivers liking or disliking a drafter, I find that it is hit or miss. Sometimes they'll do nothing, and sometimes they seem to change lanes more than a semi normally would. When they start doing that I let them go cause I don't want to make them angry.
Now I just need to mount a strip of rare earth magnets on my bumper...
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