1978 cb400a Hondamatic. What kind of fuel mileage should I get? Bike is mechanically reconditioned, starts right up idles fine. Have taken it out for some long rides. To this point I'm only getting between 25 and 30 mpg. I'm 6'2 and 250 pounds, but my xs400 yamaha does over 40mpg. Just curious about the fuel range of similar bikes.