The 1982 Honda CM450E I had would consistently better 65 mpg at sustained highway speeds, but was a bit small for comfortable fit on long rides. I bought an 81 GL1100 GoldWing (with Vetter aftermarket fairing) that returned mid 50's. I then fell in love with the GL1500 and it's silky six, but that one "only" returned 45 mpg. I sold that one for the cash to buy my Sonett.