Just as fuels are evolving, so are internal combustion engines. In the gasoline engine's more than 100 years of history it has continually evolved to the point where the best of today's engines are able to emit just miniscule amounts of pollution. New technology is also allowing large gasoline engines to achieve fuel economy more synonymous with smaller engines by shutting down individual cylinders when they are not needed. On the diesel side, the new clean diesel technology along with low-sulfur fuels has resulted in diesel engines that are just as clean as their gasoline counterparts but significantly more fuel-efficient.
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