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'06 Zongshen Sierra ZS 200. A Chinese copy of a Yamaha TW200 motor and most other chassis bits, neat-o supermoto style. Good reports of durability and mileage. First measured tank was 71mpg. Second measured tank with a 6 tooth smaller rear sprocket (40 vs 46) was 81 mpg. About 50% freeway at 60mph, the rest at about 40 mph. Small windshield, 8 gallon action packer trunk bolted to the rack. Still getting the jetting dialed in with a narrow band O2 sensor and gauge.
1988 Kawasaki Concours. 108hp, 1000cc. Fantastic weather coverage for a motorcycle. Just about 54mpg average same commute as above. A full 85 mph tank though gets just 36mpg, sheesh!
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Good design is simple. Getting there isn't.
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