If you skip the general bike news section, you likely missed this:
http://www.totalmotorcycle.com/MotorcycleFuelEconomyGuide/index.htm (http://www.totalmotorcycle.com/MotorcycleFuelEconomyGuide/index.htm)
Remember these are stock bikes with no mods. Drifter 1500 is rated at 52.5 - 800 53.5...