My Wing/Hannigan has been as high as 39mpg, during warm weather on a trip of mostly I-state. 2-up, running no more than 75mph. It has been as low as 27mpg, during very cold weather. 1-up, short runs w/some at funeral procession speed.
As a 2 wheeler, tops was 49mpg, lowest was 32mpg.
Well that's still better MPG than my truck gets...