"Engine refinement" refers to the process of improving and perfecting the performance and smoothness of an engine, making it quieter, more efficient, and more reliable. Full definition
It may fall short on engine refinement or trunk space or whatever, but when the overall package is this compelling, those things just don't matter. (automobilemag.com)
Poor engine refinement and a stiff ride also lower the overall score. (carbuyer.co.uk)
Tata has done a good job as far as engine refinement is concerned and be it at idle or when worked hard, this three pot motor never feels out of its comfort zone. (carwale.com)