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The 2006 Prius seems to kick off the engine at speeds under 25mph. The 2013 Avalon hybrid does it under 45mph. Of course I'd expect a PHEV to have a higher limit.
But the way the car decides when to turn on the engine and when not to is a bit of a pain. I often have to travel down hill on one half of my daily route and then up hill for the second half. So the car starts and warms up going downhill. Then it tries to turn off the engine for the uphill part depleating the HV battery quickly and then needing to run the engine. If there only were a way to keep it in battery mode on the down hill portion then turn on the engine for the uphill portion.
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