Why doesn’t the EPA give fuel-efficiency credit for using hybrid “start-stop” technology in conventional cars such as the Mazda i-stop?

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    It could have to do with a particular standard from the EPA in regards to the amount of fuel conserved by the system. As it is, the Start-Stop systems in cars like the Mazda save only about an average of 10% on fuel consumption, which is a relatively low number for such a touted system. It may be due to the fact that this percentage may not meet a set requirement from the EPA, and therefore will not get the fuel efficiency credit. I believe the reason hybrids get such credit is because they reduce emissions on a more consistent basis rather than just at stops.

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