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Actually i got bored and tried the other calculation. If it cost me $0.10 to charge up the battery and gas costs $4 per gallon. I could have bought .025 gallons of gas, at 45mpg I could have driven 1.125 miles. Divide that by my increase in gas mileage of 4% of 45mpg is 1.8. Which is .625gallons at 45mpg is 28 miles. So as long as I drove 28 miles that $0.10 cent charging cost was worth it.
I know I drove at least 70 miles, so i'm ahead, right?
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