Assuming 20,000 miles per year, 50 mpg, gas at $2.50 per gallon.

20,000 \ 50 = 400 gallons per year. That’s 1,000 per year spent on gas. Let’s say the Prius lasts 10 years. That’s $10,000 you’ll spend on gas in the life of the car. If you get 100 mpg (which this article says is realistic), you will save $5,000 in gas. Not bad. However, it costs $12,000 to install the Edrive. Charging the EDrive costs approximately $1 a day. Add another $3,650 to the cost. Your net loss is $10,650

The only variable is the price of gas. Only if the average price of gas in the next 10 years hovers around $5/gallon, and that is the average, will you begin to save money.

My conclusion is that it’s too early for the EDrive. When gasoline reaches a consistent 4 bucks a gallon, that’s the time to think about it.

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