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I would think 40 mpg isabout avg for any bike. Yours seems a littke lower than normal, tho. As said earlier, prob look at another map and take it from there.
My TC88 with 44mm Mikuni, SE 203 Cams, SE slip-ons and Air Cleaner would get mid to high 40s when riding country roads (55mph and under) - once on the interstate and running 75 mileage would drop into the high 30s (big carb sucked the fuel)
02FLHPI 88ci big valve heads, Andrews 21 cam S&S a/c Jackpots PCIII. IT was getting 36-38 mpg. Uphill, downhill, with the wind against the wind, HER riding it me flogging it.
Ditched the PCIII, added PCV, w/Autotune. Borrowed some AFR from iclicks map, ran a bunch of tuning runs. She is now getting 42-43mpg. Yesterday took a nice 250+ mile ride and she got 46.4mpg.
It's all in your tune. Lean it out in the cruising range, 2250-3000rpm up to 10-15% throttle in 5-6 gears. you are not going to run hot at 55-65mph on the road.
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