Going from a six- to a four-cylinder engine is a fairly drastic change, and one that could ruin the reputation of even such a stalwart as BMW. But the automaker is in good company, as downsizing engines in favor of fuel economy is in fashion.
And the new 328i shows that those two cylinders may have been extraneous, as technologies such as a twin-scroll turbocharger and direct injection make up for the displacement loss. The real upside comes in the form of fuel economy averaging close to 30 mpg.
Less successful is the idle-stop feature, which is more intrusive on … Read more