A mild hybrid in every respect.
Hybrids are hot. People have heard about them. They know a hybrid is some kind of miracle powertrain that gives 50 mpg in the Toyota Prius. And it's great for the environment.
But the Prius is a pretty small car. What would really be great is a hybrid pickup or SUV. Sure, it might not get as good gas mileage as that little Toyota, but, heck, even if it only got 30 miles to the gallon, that'd still be pretty good.
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This article has a great description of the three types of hybrid vehicles. If you don't know what they are, I suggest you read it! - Jason