Mine's a 2016, I'm the first owner, and I've put 1,700 miles on it since I got it in January. Right now, I'm averaging about 54-56 mpg, almost all highway (80mph) riding. I've put better engine coolant in it, removed every bit of weight I could, swapped for lighter parts, etc. I run 85 octane with ethanol (can't find non-ethanol that isn't premium here, and premium makes the backfiring worse) and a sta-bil anti-ethanol additive.
Honestly, I was hoping to get better mileage out of it than this. I'm still trying to figure out ways to increase it, but I'm having no luck (other than smaller / lighter exhaust, lithium battery, or removing the engine lol)
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