Interesting question, surprising findings. I looked at the traditional manufacturers and found a few over 250cc’s that were in the 60+ range. Then took a look at what Buell had to offer and was quite surprised. The Buell Blast gets great mileage with 491cc’s to get the job done.There were others that may fit your profile better that were as comparative. I would say it would be worth a look to go to their site and chk it out for a few minutes. Other than my quick look, I can’t really answer your query any better, hope this helps. Ride safe and God bless. Jon D.