Actually, I don't think they will be common. Only ppl who believes buying a Hybrid will be able to help save the earth will buy one. Will you pay 30% more money for the same car with less power just for that extra 30% in gas mileage?
I know Toyota are pushing out a more powerful version of the hybrid which is even more powerful than the gasoline only version, but there are also downsides to it. Frist of all to get more power, both gasoline engine and electric motor has to work at the same time, that means your battery are discharging. Imagine you are on a constant need for speed, your battery will dry out and you are return to your gasoline only power. However, you have more weight due to all those extra sensors, batteries and motor, your car will be slower than a normal gasoline one.
It is only clear, if you want performance, go gasoline, if you want to save money go diesel (VW diesel has very good gas milage by the way), if you have to much money and want some gadget in your car making you feel like you are actually saving money by paying more, go hybrid.
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