Forbes just released a list of the least fuel-efficient hybrids, and though the fact that some of these supposedly green rides aren't exactly saving the planet shouldn't shock too many people, it's still nice to see the guilty called out. Just because your Lexus LS 600h has some batteries in it shouldn't make you feel all nice and environmental. The thing still burns up a gallon of gas every 21 miles. Even worse: A GMC Sierra model that gets only 16 mpg. Enough said. Here's the list.—Gregory Mone

The automotive buyer’s guide published in the August issue of Popular Science featured a variety of key technologies consumers should know about when comparing new cars. What follows are additional categories likely to pique your curiosity in the showroom—diesel tech, off-road capability and all-important in-car entertainment options.

DIESELS
Tech
Diesel engines are more efficient and more powerful than their gas cousins.