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GREEN | 7 out of 10
2012 Lexus GS 350: 19/28 mpg (RWD); 19/26 mpg (AWD)
engineers were able to eke out a 2 mpg improvement in fuel economy, to a respectable 19/28 mpg.
I don't know why anyone would opt for a hybrid GS with its higher sticker price, even with the mileage gains.
delivering 19 city mpg and 28 highway (the latter number is up from 26 mpg)
The best fuel-economy ratings of the 2013 GS lineup are reserved for the GS 450h hybrid. As for the GS 350, it's scored by the EPA at 19 miles per gallon city, 28 mpg highway, and 23 mpg combined. Lexus says that's a 2-mpg improvement over the prior generation.
While that's far from class-leading, it's not at the bottom of the pack. Lexus carried over the GS' base drivetrain and its six-speed automatic, while other luxury brands have updated their offerings to include seven- and even eight-speed automatics. Even so, the seven-speed Infiniti M37 is rated lower than the Lexus GS 350 at 18/26 mpg, while the Mercedes-Benz E350 is much higher, at 20/30 mpg, and the eight-speed Hyundai Genesis sedan is pegged at 19/29 mpg.
When it's outfitted with heavy all-wheel-drive gear, the GS 350 is downrated to 19/26 mpg.
Gas mileage is better than before, though lower than the best seven- and eight-speed competition.