I only see 3 XV250's on Fuelly and they have an average of about 64 mpgUS.
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Any of the Honda CBR250/ 300, CBR500, CTX700 will get better than that. The Honda CBR125R is undersquare and is showing 87 mpg for a sample of 71 bikes but it can only reach a top speed of 70 mph if you tuck. The cheap air cooled 150's in India top out at 50 mph and return 120 mpgUS.
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Hypermiling works real good on motorcycles. My last two tanks on my CBR250R were 95.8 and 95.9 mpgUS on my 80% highway commute at 68 mph.
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