GLS550 highway mpg
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Joined: Mar 2021
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From: Beech Mountain, NC
E63s SL550 GL450
GLS550 highway mpg
I'm in the market to upgrade from our 2016 GL450 to a 2019 GLS. Settled on the 2019 as we don't care for the newer body style. I've been looking for a GLS450, but not finding one with the options that are important. I have found a couple GLS550 that check the boxes for options and colors. The GL450 has been a great vehicle. Highway fuel consumption is surprisingly good for something so large. We routinely get 24mpg on the highway. I'm wondering if someone that has a GLS550 can offer an estimate of what they get at normal Interstate speeds.
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E55, GLS450, GL63, GLE350
You may want to post this in the GLS section. GLS Class (X166) - MBWorld.org Forums
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2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
The reason you have good mpg is because your engine is v6. Late model 450 goes with v6.
Early models 450 and 550 going with same 4.6 biturbo. So it is about 16 - 18 mpg.
Early models 450 and 550 going with same 4.6 biturbo. So it is about 16 - 18 mpg.
Thread Starter
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Joined: Mar 2021
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From: Beech Mountain, NC
E63s SL550 GL450
I was aware of the different engines between the two. That is why I was wondering how much of a difference there would be on highway consumption. I was hoping that the nine speed transmission in the newer model would boost highway efficiency some. Certainly wouldn't expect 24mpg like I'm getting in the GL450m but it would have been welcomed.
Thread Starter
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Joined: Mar 2021
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From: Beech Mountain, NC
E63s SL550 GL450
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Thread Starter
Super Member
Joined: Mar 2021
Posts: 509
Likes: 217
From: Beech Mountain, NC
E63s SL550 GL450
That is better than I expected, especially from the models prior to the nine speed transmission. I could certainly live with that.
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