Highway Mileage
Senior Member
Joined: May 2019
Posts: 331
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From: Tennessee
2015 MB S550 & 2020 MB GLS 450
Congrats on mileage. I have tracked mpg of the 17,106 miles driven since I bought my 20 GLS via the Fuelly app. My best strictly highway mileage (I'm usually in Comfort mode) has been 26 mpg. Usually get 24 or so. But at a higher average speed that your 59.
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Joined: Apr 2011
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2021 GLS580 | 2011 ML350 BlueTec | 2009 Pontiac G8 GXP
We would get better milage if we drove slower. If all goes well our average speed is around 70 for 450 miles. Increasing speed from 60 - 65 to 70+ really starts to suck down fuel. 45 - 55 really is ideal for milage but it's sloooooow. 
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Joined: Jul 2022
Posts: 159
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GLS 450 (2022), EQE SUV 350 (2025). GLS 450 (2007)
I recently did a 6400 mile coast-to-coast road trip and averaged 27 mpg. Much of the trip was at 70 or 80 mph on open Interstates out West. Excellent when compared t my old GL 450 which could barely do 21 if memory serves.
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Joined: Aug 2023
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GLS 450
I've done other all-highway and seen 27-28mpg. Better than I was expecting so I'll take it.
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'23 GLS450
Anyone do the transmission recall and notice a slight reduction in fuel economy (especially in city driving)? The engine subjectively seems smoother but objectively worse via calculating mpg at the pump (trip miles / gallons filled at station).
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Joined: Jan 2024
Posts: 138
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From: Melbourne, FL
2024 GLS 580, 2022 Sprinter-based Winnebago View 24D, 2024 Bronco Raptor
It's not explicitly stated, but I assume these are v6 mileage numbers?
With the 2024 v8, it's around 15 mpg for me in city driving and 19-21 on the highway.
With the 2024 v8, it's around 15 mpg for me in city driving and 19-21 on the highway.
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GLS 450
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'23 GLS450
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2024 AMG GLS 63
also confirmed numbers with manual calculation post fueling. I like what I see.
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2020 GLS450 (wife) / 2024 Ford Bronco (mine) / 2014 VW Tiquan (son)
We're nearing 71k miles (70,861), and overall since day one, our average per the app is 23.1 MPG's with an average speed of 28 MPH. We've driven the equivalent of 3 months, 15 days, 15 hours, 36 minutes. We continue to routinely see 28mpg+ on highway cruises.
My 2024 Ford Bronco with the 2.7 twin turbo v6 is averaging 15mpg with less than 400 miles on it by comparison...
My 2024 Ford Bronco with the 2.7 twin turbo v6 is averaging 15mpg with less than 400 miles on it by comparison...
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Joined: Jan 2023
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GLE 580
We're nearing 71k miles (70,861), and overall since day one, our average per the app is 23.1 MPG's with an average speed of 28 MPH. We've driven the equivalent of 3 months, 15 days, 15 hours, 36 minutes. We continue to routinely see 28mpg+ on highway cruises.
My 2024 Ford Bronco with the 2.7 twin turbo v6 is averaging 15mpg with less than 400 miles on it by comparison...
My 2024 Ford Bronco with the 2.7 twin turbo v6 is averaging 15mpg with less than 400 miles on it by comparison...
Super Member
Joined: Feb 2017
Posts: 506
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GL350 Bluetec and GLS580
We just did a trip to Greensboro NC and back to the DC-Area, my best MPG was 20.5mpg and that was during the descent from the 600ft elevation above sea level to DC Metro's 150ft above sea level....so basically down hill for 4hrs.
This is the first vehicle I've owned where it is actually hard to beat the stated HWY MPG.
This is the first vehicle I've owned where it is actually hard to beat the stated HWY MPG.
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Joined: Jan 2023
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GLE 580
We just did a trip to Greensboro NC and back to the DC-Area, my best MPG was 20.5mpg and that was during the descent from the 600ft elevation above sea level to DC Metro's 150ft above sea level....so basically down hill for 4hrs.
This is the first vehicle I've owned where it is actually hard to beat the stated HWY MPG.
This is the first vehicle I've owned where it is actually hard to beat the stated HWY MPG.
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Joined: Feb 2017
Posts: 506
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GL350 Bluetec and GLS580
MBWorld Fanatic!
Joined: Jun 2017
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2020 GLS450 (wife) / 2024 Ford Bronco (mine) / 2014 VW Tiquan (son)
You’re a V8 580 right? Did you do the I-81 route?
we’ve done that route as well, Loudoun to Greensboro via 81. In the 450 we seem to be in the 27-28mpg area via cruise on 81. Now coming back and climbing up to 81, is a different story.
we’ve done that route as well, Loudoun to Greensboro via 81. In the 450 we seem to be in the 27-28mpg area via cruise on 81. Now coming back and climbing up to 81, is a different story.
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Joined: Feb 2017
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GL350 Bluetec and GLS580
I took the 29/360 route. I think it will soon be called the 785 corridor. Easy cruising no traffic.....for now.
I think I was on 95 for only 18 miles which was stop and go here and there.
And yes, we drove the 580.
I think I was on 95 for only 18 miles which was stop and go here and there.
And yes, we drove the 580.
Last edited by DC-BENZ; Aug 4, 2024 at 12:09 PM.
