What motor are you considering? 35mph/60kmh is closer to optimum, you're probably not going to maintain electric power for very long and 35 should be enough for 4th gear at least. Some could probably hit 5th but conditions vary.
BTW, for future reference the only reason to use electric power to assist the ICE is when you've undersized your engine and absolutely need the power. It's just for safety when merging onto highways or for a burst of power(which isn't a design goal here). ICEs are more efficient under heavier loads such as acceleration and cruising speed. Where the electric works better is outside of the bell curve that the gearing gives your ICE but usually limited to the lower speed range. For an ICE that curve (thanks MetroMPG) doesn't hit good FE until the lowest speed you can power through the highest gear without bogging.
I think Daox and MetroMPG have stated this already but I just wanted to make sure you were on the same page, Aussie. Hopefully I have my credits right, if not, you know who you are...ah crud, who was it?
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-Allch Chcar
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