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585 Posts
best I ever got was around 19 with a strong tail wind across SD, average,,,,, 14-15, I weigh 9,000LBS and drive aggresively..... the 19 came at 60-65mph, 1800RPM 2cycle, Stanadyne fuel treatment, cool temps, 4" to 5" open exhaust, opened up stock air box, on a stock engine. while running empty, my gear ratio and weight hinders me from getting up in speed. On long hauls I have a locking throttle cable under the dash that will lock the throttle at the least amount of fuel to keep that speed on a flat straight away,,, have to help it with the foot on the bumps.... this is how I got the 19, but havent seen it since in my daily runnings.