Ethenol free didn't make a huge difference for me. Maybe like an extra 7 miles for a whole tank. On my highway trip from Tennessee to NY, loaded up with an extra 100 pounds, I averaged about 46 mpg. If I fill up to the point where the fuel first touches the rim, while on the side stand, it's 3.7 gallons from the fuel light. That gets me about 180 miles to the light. You can "overfill" the bike like 6-7 10ths of a gallon from the point where you think it's full. If you just slowly drain it in, it just keeps on going in... That gets me another 20-30 miles before the light, and then you can get about 40 more miles after the light, which then it starts to stall out, and then you got like 3 more miles after a couple shakes and it'll stall going downhill...
That was the time I couldn't find a gas station after my track day and coasted down a hill into a station. Filled 5.2 gallons that time.
There's so many variables that go into gas mpg and I feel like a problem with the bike is the LAST thing that would be causing a low mpg
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