I would like to see a manufacturer or even aftermarket come out with a hybrid kit for those of us who would like more power and more gas milage at the same time (gee, think theres a market for that?
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As for convenience features...I would like it if more hybrids came with a plug so we could charge them up when we're not using them. That way we have a little more electric engine-only time on the way to work in the morning. That would drasticly bring up gas milage #'s.