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Warranties and Batteries
IIRC, CNN had something on people doing this a while back and Toyota and Honda strongly discouraged it. That is to say, they will probably void your warranty. I agree with the people doing it, but the one thing I would worry about is that it will cut the life of the batteries (which will not be covered by warranty now) and I will have to pony up for a new car or battery replacements prematurely.
RE: Warranties and Batteries by Brandon
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.