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What gear did you use for your power calculations? The sixth gear is long, at 162 km/h you will rev the engine way below the revs for max power. So you'd use less than 63 kW, and your calculations are off by less.
Your estimate for rolling resistance seems low to me, but I really have no data, just gut feeling.
Wind, in fact any wind but straight tail wind, will raise air resistance too. Side wind even more so than head on. They really should publish a car's air resistance when the air comes in at a 10 degree angle, you'd he amazed how much impact that has.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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