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An old carbureted engine with sloppy fuel distribution is no comparison to modern precise fuel injection. The two biggest improvements in engine emissions and economy are closed loop fuel and ignition systems, along with much more precise control of both.
The problem is attaining emmision requirements while maintaining economy and performance. Reducing combustion temperatures helps emmision but hurts MPG and performance. You cannot have your cake and eat it to.
posted by 97.127.24...
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