Over the past decade, the vast majority of U.S. pump gasoline has transitioned to 10% ethanol—or even, depending on where you are, 15% ethanol. The EPA tests that bring us official fuel economy numbers are just in the process of catching up with that reality. They don’t have to all be Tier 3 tests run on E10 until model year 2021... Automakers are allegedly trying to sneak in another break to fleet mpg and emissions
Over the past decade, the vast majority of U.S. pump gasoline has transitioned to 10% ethanol—or even, depending on where you are, 15% ethanol. The EPA tests that bring us official fuel economy numbers are just in the process of catching up with that reality. They don’t have to all be Tier 3 tests run on E10 until model year 2021...