Seventh Edition, Fourth Revision for the CLASSIC (2001-2003) model. Ignore the advanced technology! It’s too easy to get preoccupied with everything Prius automatically does for you, especially with the Multi-Display providing constant performance information. The hybrid system was designed so you could to drive it like a traditional car. That way, you can enjoy the remarkably smooth & quiet ride. Let the computer worry about how to save gas and reduce emissions.
Startup
Engine Warm-Up Reducing Emissions is the highest priority for Prius. It strives to remain a SULEV (Super Ultra Low Emission Vehicle) at all times, which means the catalytic-converter must be kept warm even if that requires consuming some gas to accomplish that. Fortunately, you still get better than average mileage, even if the engine doesn’t shut off right away.
Winter Heat Creating heat for the emissions system and heat to keep you warm is fastest and most efficient if you simply drive gently immediately after starting the Prius in the winter. Allowing the engine to run while the Prius is parked takes longer and is less efficient. “Just Drive It!” The user-manual states to turn the key and hold it until you hear a beep. Realistically, you can
Turning the Key actually let go of the key immediately. Once the computer accepts your request, the engine will start-up after preparation is complete. Think of it as clicking a button on a computer-mouse. The catch is you must still wait for the “READY” prompt before shifting into Reverse or Drive.

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