What does the use of SCR deliver?

The correct answer highlights that the use of Selective Catalytic Reduction (SCR) is primarily aimed at improving fuel economy in diesel engines. SCR is an advanced emissions control technology that reduces nitrogen oxides (NOx) emissions by converting them into nitrogen and water vapor through a chemical reaction facilitated by a catalyst. This technology allows the engine to run more efficiently by optimizing combustion processes and enabling higher efficiencies, thus leading to better fuel economy.

In addition to enhancing fuel economy, SCR can lead to lower overall emissions by allowing the engine to operate under ideal conditions. The implementation of SCR typically involves the use of urea, which is injected into the exhaust stream. This process not only helps meet stricter emissions standards but also permits engines to maintain higher performance without sacrificing efficiency. This means that, while maintaining regulatory compliance, vehicles can be designed for improved fuel efficiency, which is a significant benefit for both manufacturers and consumers in the diesel automotive industry.