Are diesel engines more efficient than gasoline engines?

The diesel engine has always been the most efficient internal combustion engine available, but thanks to new technology, the gas engine is quickly catching up. read more

In fact vehicles powered by compression-ignition engines are often dramatically more fuel efficient than their gasoline counterparts. In fact they can be up to 30 percent thriftier, which is HUGE. Take a look at the 2015 Audi A8 L for instance. With a 3.0-liter supercharged gasoline V6 under the hood its combined fuel-economy rating is 22 MPG. read more

The compression ratios of diesel engines are much higher than the compression ratios of petrol engines, so more energy extracted per stroke. More energy output for a given input = greater efficiency. So that’s why diesels are more efficient than petrol engines. read more