According to Cycle World (my favorite cycle magazine) the Ninja is 356lb dry, got 53mpg in their tests, 25.5 hp, and 13.5 ft-lb torque. The Honda is 337lb, 57mpg, 23.7 hp, and 12.7 ft-lb torque. They also say the Ninja needs more maintenance, for what it's worth.
I'd still get a Ninja, albeit used, since the price is so much lower vs a new Honda. But who knows how much the mpg could be improved with mods :P
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