Yeah, I read your article both here and the commentary it generated on Slashdot. In typical Slashdot fashion, the responses ranged from constructive and insightful from well informed people to crazy rants from self-righteous wanna be's that think they are smart. Anyway, I think the hybrid upgrades are cool as hell in their own right from an engineering standpoint even if it doesn't meet the cost analysis, which is exacerbated by the battery issue if you cut your battery life and have to prematurely replace them. Still, there is something to be said for saving energy even if it doesn't save you money right this second.

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RE: Warranties and Batteries
I've also read about this before. I found a concept Prius plug-in online that is supposed to get 125 mpg. There's a company in California that is going to start doing the conversions - it also claims over 100mpg for the converted Prius+.
Taking a look at my hybrid article, given this increase in gas mileage, the ~110mpg converted Prius would need to be cheaper than $14,800 to save you more money than the leading economy car, assuming gas prices stay at about $2.50. If they go up to $3.00, it would need to be cheaper than about $15,200. Dang, that graph is handy.
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