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It is for supplemental power beyond the capability of the electric motors. (during the seasons when you use the heater, the gas engine will operate more frequently... because the only source of heat is the gas engine) The Prius will run around town on level grade at 35-37mph without the gas motor running, at least until the battery needs to be charged. I have gone more than 6 miles.

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Q: Do hybrid cars like Prius use their electric motors when accelerating at high speeds?
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What kind of hybrid system does the 2011 Camry have?

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