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2015 Mercedes-Benz SL400 Rated 20/27 MPG With New Twin-Turbo V-6

Motor Trend logo Motor Trend 8/7/2014 Karla Sanchez

The 2015 Mercedes-Benz SL400 is new for 2015, and although we already knew its V-6 would make it more fuel-efficient than its V-8-powered counterparts, now we know just how frugal it is. The EPA has officially rated the SL400 at 20/27 mpg city/highway, and has also revealed numbers for the new ML400 4Matic.

Powered by the same 3.0-liter twin-turbo V-6 found underneath the hood of the 2015 C-Class, the SL400's 20/27 mpg compares favorably to the 2015 SL550's 17/24 mpg. Of course, that's because the SL400 makes 329 hp and 354 lb-ft of torque compared to the SL550's 429 hp and 516 lb-ft that comes by way of a 4.7-liter twin-turbo V-8. Both engines come paired with a seven-speed automatic. Curiously, the SL550 loses one mpg in both city and highway compared to the 2014 model. Either way, the SL400 has the fuel economy advantage, and its lower cost of entry should help attract buyers. 2014 Mercedes Benz SL550© Provided by MotorTrend 2014 Mercedes Benz SL550

As for the ML400 4Matic that's to replace the V-8-powered ML550, the SUV achieves 18/22 mpg, which is an improvement over the 2014 ML550's 14/19 mpg. The ML400 is powered by the same twin-turbo V-6 mentioned above, meaning those wanting V-8 power from their ML will have to opt for the range-topping ML63 AMG, which will be the only V-8 variant in the U.S. The 2015 ML400 4Matic achieves one mpg more in the city compared to the ML350 4Matic, and also produces more power compared to the ML350's 3.5-liter V-6 that makes 302 hp and 273 lb-ft. But then again, the price difference between the two models is nearly $15,000. Also new for 2015 is the ML250 Bluetec, which replaces the ML350 Bluetec. That means the 3.0-liter turbodiesel V-6 has been dropped in favor of a 2.1-liter twin-turbo I-4 diesel that puts out 200 hp and 369 lb-ft of torque. Fuel economy numbers have not yet been released, though we can expect it to improve on the outgoing ML350 Bluetec's 20/28 mpg.

Source: EPA

2014 Mercedes Benz SL550© Provided by MotorTrend 2014 Mercedes Benz SL550

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