The last two motorcycles I had on the road were a Suzuki DRZ 400s Dual Sport and a Suzuki Hayabusa 1300. The DRZ was stock except for having the air box opened up with an aftermarket filter and a jet kit. No fairings and I never got worse than 52 MPG on my daily commute which included WO throttle on the interstate and some stop and go traffic. On back road blasts I would get over 60 MPG. The Hayabusa (fastest production motorcycle at the time and still one of, if not the fastest production bike) had dynoed 160 RWHP (bone stock from the factory 1.3 liter ) and weighted around 550 lbs. On the interstate, I never got less than 42.5 MPG usually got 45.5 MPG no matter how fast I rode. Did a 80 mile run after filling up one evening that included a stretch of construction zone (45 MPH) on 75 North. The high number on my GPS that night was 155 MPH. The trip took 1 hour and produced 45.5 MPG. The Hayabusa is very aerodynamic and designed for top speed. I know another person that managed to get well over 50 MPG on one with some minor tuning. Some pretty amazing stuff out there these days...
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