My buddy has a set of Yamaha street bikes(R1, R6 and a few 250s), but the bigger the engine displacement the maximum limit decreases. anything over 1 liter on a bike and you will struggle to punch 40 whereas I've used his 250 to get 60s riding it pretty hard(I weigh a scant 138).
Although. . .If you really wanna push it the "ugly" Cd part of a bike is higher off the ground than a car. Which is ideal for tractor trailers because at my car's nose there is not alot of shielding because its by the tires, but a bike has most of its mass behind the actual doors.
I commuted 40 miles on the highway and intentionally waited for a trailer to leave to and checked it on the other side and it was only a third of a gallon. I could have broken my headlight on his step-bar pretty easily though. Wouldn't recommend it. . .
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