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Well I had lots of two strokes GT380's one with chambers, and even a GT750 water buffalo and they never got even near the Mileage of my GS1000, i think I got over 50 mpg at 70 MPH and interestingly enough though the oil costs more because a four stroke , or most of them have no seperate gearbox, so if you ride hard you better change the oil a lot, like 2000 miles or less, and a two stroke running golden spectro uses only about a pint per 3 or 4 hundred miles if you lean them out , which you can do with the Spectro so your oil costs are actually higher with a four stroke , or very close, My GT 380 stock went from 100 top end to almost 110 with the spectro after a few hundred miles , Yamahas were tuned to go fast never very happy running slow like a Suzi.
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