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I would generally agree with you. I can't say weather those are optimal, average, or worst case numbers.
However, I'd like to clarify that it doesn't require anywhere near 50hp to keep you going down the road even @ 65 mph. From my general calculations using a conservative drag coefficient of .5 and a frontal area of 1.995m^2 (also conservative), you only need 19.7hp to keep you going 65 mph down the highway. Your Cd and frontal area are likely a bit better than those mentioned, so I'd estimate between 15-19hp to keep you going on the highway. Knock that speed down to 40 mph and you only need 4.6hp!
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