The Lexus LS lineup is made up of some of the most technologically savvy vehicles on the planet--not the least of which is the complex, gas-and-battery LS 600h L hybrid. With all the electronics and innovation, though, the LS sedans still are only about as fuel-efficient as a seven-seat crossover.
The EPA rates the rear-drive LS 460 and its long-wheelbase companion at 16/24 mpg, about what you'd see in Toyota's Highlander ute. All-wheel drive lowers the highway rating by one mile per gallon. The LS 600h L hybrid, meanwhile, earns a rating of 19 mpg city, 23 highway—superb in the class.
And purely from a green perspective, the standard LS 460 is a better pick for carrying five adults in comfort than most full-size sport-utility vehicles. That said, if you can forgo a little interior space, the Mercedes-Benz E350 Bluetec has a clean-diesel engine and enables an even better 33 mpg on the highway.