Lately, automakers haven't been touting the rising fuel economy of new vehicles, but it has to continue rising to meet reductions in the legal levels of carbon emitted. While major strides in fuel economy have been made over the past five years, the complex engine technologies and other improvements turn out to have less effect in real-world... Complex engine tech gets better ratings, does little in real world: report
Lately, automakers haven't been touting the rising fuel economy of new vehicles, but it has to continue rising to meet reductions in the legal levels of carbon emitted. While major strides in fuel economy have been made over the past five years, the complex engine technologies and other improvements turn out to have less effect in real-world... 
Automakers may gradually be putting more emphasis on plug-in electric cars and conventional hybrids, but they are far from done with plain old internal combustion. Over the past few years, automakers have applied more technology to a wider array of cars in order to boost their efficiency to meet stricter fuel-economy standards. The most popular... 
When it comes to improving fuel efficiency, simply making an engine smaller is a fairly direct way to get results. It's the approach that many automakers have taken in recent years. They have downsized engines across model lines, usually adding turbochargers at the same time to match the power output of the larger-displacement engines that they... 
Stricter global emissions standards have led many automakers to downsize engines, but that trend may be about to reverse itself. Cutting displacement is a relatively straightforward way to improve fuel economy. But as regulators move toward adoption of more realistic testing procedures in the wake of the Volkswagen diesel scandal, automakers may...