I remember my old Suzuki GS1000 (I had a Windjammer, bags, and trunk) would get 25 mpg. Later I got a Chevy Sprint (Suzuki 1000 triple engine) and it got 45-50mpg driving the same route. My 1000 Sportster did well, about 50mpg, as did my XT500/600's at 60mpg, but most my other bikes didn't do very well.