They have. Now the only question is will they be reliable (time will tell) and will the public go against years of marketing and belief in the import to give them a try:
http://usnews.rankingsandreviews.com/cars-trucks/rankings/Hybrid-Cars/
Of course the sticker price might kill them as the public won't buy at that price...

>>I remember a time when American car companies were consistently beaten by Japanese companies. Even GM shrunk and Toyota became the world's number one car manufacturer. They won more awards and had higher resale value. That's not true today. American companies, particularly GM and Ford are now topping Toyota in many areas.
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>Too bad they can't make a hybrid (or any other high MPG vehicle) that competes with Toyota or Honda.
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>>>I don't agree with you. People buy Iphone because there are a lot of applications with Iphone and Iphone is a stable and easy-to use phone. Why there are a lot of applications with Iphone? Because it has a good OS. Why Iphone stable and easy-to use, because it has a good OS. So we can say people care about OS.
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>>>Microsoft failed with former Windows Mobile versions. Why people trust Microsoft and why people try it again? It would be an adventure.