Fuel Economy / MPG » 6
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GREEN | 6 out of 10
2012 Mercedes-Benz GL350 BlueTEC: 17/21 mpg
2012 Mercedes-Benz GL450: 13/18 mpg
2012 Mercedes-Benz GL550: 12/17 mpg
Large SUVs rarely earn gas mileage ratings that look good in the grander scheme of things. It holds true for the Mercedes-Benz GL-Class, though it's offered with a green powertrain option.
The turbodiesel engine found in the GL 350 helps the fuel-economy cause along, but the six-cylinder is rated at 17/21 mpg--a shade less than the hybrid Chevrolet Tahoe. The diesel's driveability make it a worthwhile option, though every so often, your service department will need to refill the GL 350 BlueTEC with special fluid that treats its exhaust for cleaner emissions.From the diesel's peak, fuel economy across the GL-Class lineup drops sharply. With the 3.5-liter V-6 aboard, the GL450 checks in at 13/18 mpg. Tap the power of the GL550's 382-horsepower V-8, and fuel economy falls to 12/17 mpg--right down there with the least efficient Escalades and Range Rovers.
Diesel versions earn better numbers, but on the whole the Mercedes-Benz GL Class isn't that efficient.