I finished this 1500 for a buddy of mine and it turned out to be the first Endeavor conversion in Minnesota. I can't remember what the 1991 1500 I used to have got for mileage but his is getting a miserable 23mpg. We just cleaned the air filter and plugged the air jets. It runs like a top and is smooth as silk but not near the power of the Valkyrie which even with 6 carbs gets 31 on average. It is also a trike and in general the conversions have little to no effect on economy.