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Under most conditions and especially when going against the wind my Insight gets best economy around 58 km/h (35 mph) where the (drum-belt system) CVT maxes out and the revs begin to climb if I go faster.
With the wind that resistance is less of an issue and I can get somewhat faster without suffering FE wise. The CVT stays maxed out at higher speeds unless I accelerate or go really fast. Above 55 mph I rarely get top FE though.
Going slower than 30 mph will see it use EV mode every now and then, which uses DFCO but still spins the engine. Revs will stay at around 1000 RPM. And inevitably it will need to recharge the battery, getting relatively bad FE on that part. The losses due to extra engine rotations and charge/discharge are bigger than the gains from less air resistance, AFAIK. It is hard to maintain good FE numbers when going slow for a long time.
Toyota's HSD 'CVT' gearbox has no upper mile per rev limit so I guess best speed for FE on that varies even more with conditions than on mine.
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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.
Last edited by RedDevil; 09-09-2015 at 06:03 PM..
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