He is a little high on the mpg for the Ninja250. I get 66 mpgUS at 65mph on my 2009. But there is a new 1/4 liter from Honda. My 2011 CBR250R is rated at 77 and I get 87 mpgUS all summer long on my highway commute at 65mph. I can get 91 mpg at 45 mph. 23 hp fuel injected single with an O2 sensor and a big catalyst. Top speed is 93 mph and it is a dream to ride all day long on the big highway at 75 mph in the pouring rain with only your toes getting wet. Sells for $4100. $4600 with ABS.
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2011 CBR250R Overview - Honda Powersports
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The CBR125R can get 95 mpg at 60mph
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Honda Motorcycle
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There are air cooled Hondas in India such as the Shine or the Twister that sell for $1700 and get 120 mpgUS at 45 mph.