I think it is a shame to burn precious oil in combustion engines, since it is so valuable for hi-tech industries (including the IT industry!). The way to go are bio-fuels.
Well, the title of the comment says it all. Oil should be used to make plastics, not to be burned in combustion engines. With careful management, our worldwide oil reserves can last a LONG time, and be used in the most productive manner possible. Burning them for fuel is the same as throwing them away.
