GLS Class (X166) Produced from 2016 to 2019

GLS550 MPG

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Old Apr 13, 2021 | 01:42 PM
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Gregory Thomas's Avatar
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looking for gls
GLS550 MPG

I’ve had a 2017 GLS550 a little over a month now and I’m surprised at how good of a mileage I’m getting. This was a recent weekend trip for my family of four with a mix of city and highway.
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Old Apr 13, 2021 | 06:01 PM
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2017 GLE350 4MATIC
That's amazing. Same fuel economy as my GLE350. So the GLS550, a larger and heavier vehicle with a larger engine, gets the same fuel economy as a smaller vehicle with a smaller engine. Wow. Congratulations!
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Old Apr 14, 2021 | 09:19 AM
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MB GLS450
I agree. I was surprised at my GLS450 on road trips. I wasn’t expecting the mpgs to be this high. I can easily get over 500 miles on a tank of gas on long hwy road trips.

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Old Apr 14, 2021 | 10:15 AM
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Also great results @JaTe . Seems like the 166 platform fuel economy for gasoline engines is M276 V6TT > M278 V8 > M276 V6NA
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Old Apr 14, 2021 | 02:00 PM
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2008 GL320CDI (310k), 2017 GLS450 (170k), 2024 Sprinter 2500 (40k)
We are looking to get a GLS and the only reason I'm not really looking at 550 is because of fuel economy. But those numbers you got are not bad at all.
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Old Apr 14, 2021 | 03:09 PM
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Originally Posted by JaTe
I agree. I was surprised at my GLS450 on road trips. I wasn’t expecting the mpgs to be this high. I can easily get over 500 miles on a tank of gas on long hwy road trips.

wow that is small economy car territory.
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Old Apr 15, 2021 | 08:44 AM
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GLS550, GLE450 Coupe
You guys are clearly not enjoying your twin turbos enough!
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Old Apr 24, 2021 | 07:19 PM
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2019 Porsche GT3, 2013 Mercedes G550, 2024 Ford F150 Raptor, 2024 Tesla Model Y
80k miles and almost 5 years here. 14 mpg over that entire time. Probably 70 percent city. This is measured with the app gas cubby. I'm happy with that, I also don't think over 20 mpg is realistic.
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Old Apr 26, 2021 | 12:46 PM
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Those petrol economy figures are astounding! I'm struggling to achieve those in my GLS 350d (albeit I like to use my right foot), but still, pretty damn good!
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Old Jun 18, 2021 | 05:07 PM
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AUDI Q7

Hello Gents,
Roadtripin' (after Liqui Moly ritual). Car loaded to the max! Ac blast on. On Mobil Supreme++ Gas.

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Old Jul 13, 2021 | 02:12 AM
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AUDI Q7

During the past he a t dome in Seattle (115°F). I'd wager the new 580 gets even better MPGs.
nonetheless, very happy how rig performed during a 4500 miler trip, mostly thru hot temperatures.

Chirboiz,

Bob
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Old Jul 16, 2021 | 05:51 PM
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2017 GLS 550
Our 550 got around 22 mpg driving from Phoenix to Park City, UT and back the last two weekends. What a beast, so comfy, so quick, I love this thing.
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