Quote:
Originally Posted by Isaac Zachary
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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I think in your case your best option is to find a block heater for your Prius. Your engine starts to get everything up to operating temperature, which is really inconvenient when you're trying to roll downhill. A block heater would let you externally heat everything up before hand and greatly shorten the warmup process. They're generally used to keep engines and batteries warm in below freezing temperatures, but they're a valid choice elsewhere too, if you have a place you can plug in the heater.
If you are willing to get more involved you could also wire in a fuel cutoff switch that you trigger in neutral, the car doesn't seem to care what the engine is doing until put into drive, then it starts complaining about the empty fuel lines.
[Source: hobbit from technofandom]