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You have nailed the key point. Most people want at least 45hp and some extra weight. So the CTX is perfect where it is. Looking closer at the Fuelly data, even though the usual riding habits of all of the posters could be better for FE, these habits are probably comparable across these models...

Ok... Too bad I mentioned torque in the second part of my reply. Torque for a given displacement happens either way. With the increased force of a bigger bore. Or the increased leverage of the longer crank radius. When I say the Honda 500 engine is long stroke and the 700 engine is longer...

You said it yourself in the first sentence. For any given displacement, a longer stroke will have a more compact bore with much less area in the combustion chamber to waste heat. And extra leverage on the increased radius of the crank arm for more torque at lower rpm.

The Honda 700 engine has fantastic fuel efficiency when ridden carefully and would probably be neck and neck with the 500. Both of which can get within 15% of the much smaller 300/ 250 due to their long and longer stroke and low and lower rpm cam. Just think what the efficiency would be if they...

I do promote the new Honda 700"S so it is good to be on here also.

Fuelly is a great resource where prospective shoppers can find out what real owner's get for fuel economy. Honda has made a major commitment to offering the world fun, affordable, and green transportation with their scooters, 250, 500, and 700 families of motorcycles. Featuring O2 sensors, cats...