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Less fuel used = less emissions is totally false.
I'll take my own car as an example. My 2000 TDI is tier 1, that means it does not even meet bin 10 of tier 2 which is set at 0.4 g of nox per mile, but is below 1 g per mile. The new jetta TDI 2009 meets bin 5. That's 0.05 g of nox per mile. My 2000 emits at least 8 times the nox of a 2009.
8 times less nox, yet that car was driven across all 48 states averaging 58 mpg...
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