[elhigh]

A lot of compact diesel manufacturers will provide a BSFC chart for their engines, and you can set up your generator system to run right in the engine's sweet spot for the best effect. I like Lombardinis; they're available in either air or water cooled models, have lots of market presence and are widely recognized as reliable, flexible powerplants.

As to the wind genny idea, skip it. There's insufficient wind down low to do much good, finding the perfect spot to park your car would be prohibitive, and it would take up an enormous amount of space inside while driving. Besides, one curious fool could easily poke a finger in there and lose it to the blades, and you'd be liable for having presented an "attractive nuisance." At least with solar, all you have to do is park in a sunny spot and have done. Mount the wind genny at the house where you can put it up off the ground some, and wire it up to the car for charging where you have some control over the latent risks of whirling bits of metal.