A more useful answer: I don't think I would see myself using my 7AT's 6th or 7th gear to accelerate on any reasonable track. If the track had a long slow curve or straight where for whatever unrelated reasons I desired to maintain constant speed for a stretch, I might drop into 6 or 7 just to give the engine a rest, but useful acceleration at speeds the stock aerodynamics can handle all occur in gears 1-5 on the 7AT w/ stock diff ratio. 6MT may have a different answer, as the transmission and diff ratios are all different.
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