Gasoline prices in parts of Europe are currently at $9 a gallon. I think it's safe to say that if those prices were ever to reach the United States, it would feel like the sky fell on our heads. With prices that astronomical, you would think that the streets of Europe would be littered with Toyota Priuses, Honda Insights and Chevrolet Volts. However, instead of embracing Hybrids, the Europeans have turned to an old automotive friend, the Diesel engine.