Which statement is true regarding an engine with Tier III Emissions compliance?

An engine compliant with Tier III emissions standards typically incorporates an evaporative emissions system. This system plays a critical role in controlling and reducing the emissions of volatile organic compounds (VOCs) that can escape from the fuel system. By capturing fuel vapors that would otherwise be released into the atmosphere, this technology helps to ensure that the engine operates within the strict emissions limits set by regulatory agencies.

Tier III standards focus on significant reductions in harmful emissions, particularly for smaller engines, by mandating various technologies and practices to improve environmental performance. The introduction of an evaporative emissions control system can be a key aspect of meeting these requirements, thus enhancing the engine's overall eco-friendliness while still allowing for adequate performance levels.

The other statements do not accurately reflect the complexities or requirements associated with Tier III compliant engines. For instance, such engines often necessitate additional systems to adequately address emissions, they are not designed solely with performance as a goal, and they frequently demonstrate improved efficiency compared to older models due to advancements in technology and emissions controls.