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Uh, you're being *kind* to our gobberment EPA dummies!
Fuel economy would immediately double (possibly triple) if engines were allowed to operate at lean-burn Air/Fuel (16-18:1) ratios instead of only stoichiometric (14.7:1) as they must do now (to feed the damn catalytic converters).
EPA is a master of "unintended consequences" where today's mandate creates tomorrow's headaches. Just wait for the AdBlue™ / Urea (piss) problems coming from the diesel people, such as GM's diesel truck owners.
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