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Non-hybrid stop/start systems installed on 35.7% of US light-duty trucks produced in MY2018

In 2012, less than one percent of all cars and light-duty trucks were produced with a non-hybrid stop/start system. Through 2015, cars had the greatest share of stop/start systems installed. After 2015, the greatest share of start/stop systems was installed on light-duty trucks, rising to 35.7% of all light-duty trucks produced in model year (MY) 2018.

Stop/start systems are designed to conserve fuel by reducing idle time when a vehicle is stopped. In city driving, where traffic lights are frequent, the stop/start system will shut down the engine as the vehicle comes to a stop and will automatically restart the engine when the brake pedal is released. Hybrid vehicles have always done this but, in recent years, manufacturers have been installing stop/start systems on greater numbers of non-hybrid vehicles as well.


Non-hybrid stop/start technology penetration for model years 2012 to 2018 for cars and and light-duty trucks. Notes: Data for 2018 are preliminary. The car category includes cars and car sport-utility vehicles. The light-duty truck category includes pickups, vans, and truck sport utility vehicles.
Source: U.S. DOE, U.S. Environmental Protection Agency, The 2018 EPA Automotive Trends Report: Greenhouse Gas Emissions, Fuel Economy, and Technology since 1975, EPA-420-R-19-002, March 2019.



What would also be interesting is to see data on actual usage of these systems (that is, how often are they left enabled).

A lot of the non-hybrid stop-start systems introduce a fair amount of delay due to restarting the engine (whereas some hybrids can start rolling on electric before the engine's running, and even the mild systems have more power available to start the engine smoothly), and the US light-duty truck market is a market that's particularly resistant to change...

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