You know, not for nothing, but I really don't care much about the possible impact on emissions due to hypermiling. Even if I ripped off the cats and made the engine burn as lean as knock-free-ly possible as part of my ecomodding, every gallon of gas I didn't burn traveling resulted in exponentially less emissions when factoring in the production of the fuel than the possible added level of emissions going out the tailpipe.
It's all relative, really. *shrug*
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