End of the line for start-stop? usa epa to scrap fuel-saving feature

Start-stop technology facing demise in usa

For years, car manufacturers have implemented various technologies to reduce emissions. Systems like particulate filters, start-stop systems, and AdBlue have become commonplace. However, a growing debate surrounds the effectiveness and long-term consequences of these technologies, particularly the ubiquitous start-stop feature. Now, the US Environmental Protection Agency (EPA) is poised to significantly alter the landscape by potentially ending incentives for its use.

A brief history of start-stop

The concept of automatically shutting off the engine when a vehicle is stationary dates back to the 1970s and 1980s, but it didn't gain widespread popularity until the mid-2000s with the implementation of Euro 5 emission standards. The primary goal of start-stop technology is to improve fuel efficiency and reduce emissions, especially in urban environments. Studies suggest potential fuel savings of up to 5% in dense traffic. However, this comes at a cost, raising concerns about the impact on engine components and battery life.

The battery burden

One of the primary drawbacks of start-stop systems is the increased strain on the battery. These systems require batteries with higher capacity to withstand the frequent start/stop cycles. This often means using more expensive battery types like AGM (Absorbent Glass Mat) or EFB (Enhanced Flooded Battery). Each engine start demands a significant electrical surge, and repeated cycles accelerate battery wear. Consequently, the lifespan of a start-stop battery is typically shorter, averaging between 3 to 5 years, depending on driving conditions. This also translates to higher replacement costs.

Emissions reduction vs. component wear

While start-stop technology offers a potential 5% fuel savings in city driving, the question remains whether the benefits outweigh the drawbacks. It's a response to the European Union's mandate to reduce vehicle emissions, but it has generated issues, similar to the problems experienced with diesel particulate filters. A prime example is the PSA (Stellantis) PureTech engine, which initially had issues with oil-soaked oil cooler hoses after the introduction of particulate filters to meet Euro 6 regulations. With start-stop, the wear may be less noticeable initially, but can manifest as system malfunctions or difficulty starting.

Epa considering the end of incentives

The current administration is actively pursuing the termination of incentives for start-stop technology, echoing previous statements from EPA Administrator Lee Zeldin. He stated that the technology had been approved due to climate participation trophies, but was now being