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Not quite sure how to answer that.
The Prius doesn't separate out GAS vs ELECTRIC use. I don't suppose there's way to read amp-hours with the scangauge, is there?
The only thing I can think of is to only recharge the car from the same Kill-a-watt every time to keep a cumulative record of electric use, AND track how much gas is put in at the pump, AND look at the trip odometer.
That way, I could figure out total distance AND gas vs electric use. Even then, how do you know if you are getting really good gas use and bad watt-hours-per-mile or bad gas use and really good low watt-hours-per-mile?
I suppose that if I could figure out a route I could drive as ONLY electric (with the engine never coming on) I could calculate watt-hours from that.
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