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I carefully kept records of gas/mileage for a few weeks this summer, and it all averaged out to around 42 mpg. That was almost exclusively two-lane blacktop riding. My motor is not stock, but not that heavily modified either - Wood 6 cam, shaved heads for slightly higher compression, high-flow air cleaner on a later model CV carb with Wood jets and needle, true dual exhaust, high performance ignition.
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Pretty much what mine gets at 70-75mph on the interstates: 40-45 mpg. I usually start looking for a gas station every 160-180 miles, and 'normally' it will take 'around' 4 gallons to top it off. All depending on how many times I had to hold 80 mph to get around traffic and how strong the wind was. Oddly, having a passenger seems to have minimal effect on my mpg figures.
im getting about 44 mpg on my 90, i have a cam and S&S Super E. my neighbor had a 93, about the same motor, and said he got 46 mpg. so i dont think id mess with the carb to just pick up 4 or 5 mpg. now if you were getting 35 mpg then it might be worth checking.
45 pilot is the smallest you want to go
the needle can only be shimmed richer from stock, but of course may be too high now from other tuning attempts, although 41 mpg does not suggest that