Hey guys. just got a reading of 55+ MPG over a course of 145 miles! besides that, how much do the speedos vary from bike to bike? My dad's '86 at 4k rpm, is ~60 mph. my 2001 at 4k rpm is 55mph. how much will new tires vs. worn tires effect it? My bike has a NEW front and rear. my dads has a NEW rear, worn front. what are some of your speeds at various rpms. I really wanna check mine with a gps.