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re: I’m skeptical that auto stop / start on automobiles is a great feature for saving fuel

Posted on 8/13/18 at 1:16 am to
Posted by shotcaller1
Member since Oct 2014
7501 posts
Posted on 8/13/18 at 1:16 am to
My opinion is that this was done to inflate mpg ratings for a given vehicle
Posted by VetteGuy
Member since Feb 2008
28428 posts
Posted on 8/13/18 at 11:16 am to
It helps the EPA number and MPG, which helps the CAFE number:

Automakers get incentives to do it this way from the Environmental Protection Agency. If the vehicle’s stop/start system is nonlatching and automatically turns on whenever you start the car, the EPA’s fuel-economy test results will be calculated only when the system is engaged. But if a vehicle’s stop/start system can be permanently turned off, then the vehicle’s fuel economy is tested both when stop/start is active and when it’s off. The EPA then averages the two tests for a resulting fuel-economy rating found on the car’s window sticker—which is certain to be lower.

Since stop/start is estimated to boost fuel economy by 4 to 5 percent using the EPA test cycle, according to Buick, obviously it has a positive effect on the fuel-economy rating. Carmakers who have nonlatching stop/start systems also qualify for additional “off cycle” emissions credits from the EPA, and those can be applied to meet their overall targets for Corporate Average Fuel Economy standards.


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