GLK-Class (X204) Produced 2008-2014

MPG update

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Old Aug 17, 2012 | 11:06 PM
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2024 GLC300, 2014 BMW M235i
MPG update

Just returned home today from a 4325 mile trip through the northwestern states. Trip computer indicated exactly 25.0 for the entire trip. For the past few days it had been hovering at 24.9, but it bumped to 25.0 today when we averaged 25.7 on our last leg home.

Yesterday, we logged 27.9 on the leg from Boise, ID to Winnemucca, NV.

Now I'm left wondering why the EPA highway rating is only 21. 4325 miles isn't exactly a short trip, so I think our 25.0 MPG is very realistic.

3.5L
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Old Aug 21, 2012 | 12:56 AM
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I'm wondering too

Wife and I have made trips from WV to MO in both of our little SUVs. We discovered that our Mercedes gets better average mpg on these trips than our Honda CRV does. Apparently running 70 - 75 MPH on the interstate isn't the Honda's forte.

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Oldengineer
2011 GLK 4Matic
2010 Honda CRV LX 2WD
1948 Chevrolet Fleetmaster Town Sedan
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Old Aug 21, 2012 | 09:36 AM
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3.5L - what speeds are you operating at?

We notice that 70-75 like Oldengineer is referencing allows optimal MPG (25 mig-ish).
However, as you bump it towards 80 & above it incrementally gets less obviously but we still get in the 23's.
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Old Aug 21, 2012 | 09:45 AM
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A hunch, based on doing the arithmetic for some long highway jaunts, is that the trip display is a couple MPGs optimistic. Still, 23mpg isn't too shabby.

Wayne
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Old Aug 21, 2012 | 11:54 AM
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Originally Posted by Oldengineer
Wife and I have made trips from WV to MO in both of our little SUVs. We discovered that our Mercedes gets better average mpg on these trips than our Honda CRV does. Apparently running 70 - 75 MPH on the interstate isn't the Honda's forte.

Regards:
Oldengineer
2011 GLK 4Matic
2010 Honda CRV LX 2WD
1948 Chevrolet Fleetmaster Town Sedan

Hwy speeds stress a 4 cylinder more than a 6...
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Old Aug 21, 2012 | 02:55 PM
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Originally Posted by venchka
A hunch, based on doing the arithmetic for some long highway jaunts, is that the trip display is a couple MPGs optimistic. Still, 23mpg isn't too shabby.

Wayne
Ha - I haven't done the odometer mileage divided by printed gallons on the receipt math in awhile.
Thanks for reminding me to go back to the basics!
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Old Aug 22, 2012 | 12:35 AM
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Originally Posted by rmfnla
Hwy speeds stress a 4 cylinder more than a 6...
The problem with the Honda is its torque curve - its very peaky and doesn't make any suds until very high RPM. Consequently, at every little rise in the road, it has to downshift and scream its guts out to maintain speed. Honda needes to redesign the engine to make its torque curve mesa shaped.



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Oldengineer
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Old Aug 22, 2012 | 10:32 PM
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From: Central coast California
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Originally Posted by MBNA109
3.5L - what speeds are you operating at?
Speeds were all over the map. We cruised for hours at 75 out in the boonies, yet found ourselves at 55 for hours in constructions zones. Some parts of highway 101 in Oregon and Washington got down to 35 MPH stretches. Still, I didn't hesitate much to hit 90 MPH passing a line of trucks on two-lane highways. Also did a fair amount of city driving.

Summary is that I don't flog my GLK much. When I need to, I'll punch it to get by traffic, but most of the time I accelerate with traffic and enjoy the smooth, quiet ride.

3.5L
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Old Aug 22, 2012 | 10:38 PM
  #9  
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From: Central coast California
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Originally Posted by venchka
A hunch, based on doing the arithmetic for some long highway jaunts, is that the trip display is a couple MPGs optimistic. Still, 23mpg isn't too shabby.
Wayne
Don't consider this absolute, but when I made a 1400 mile round trip to Tucson last April, I used our gasoline receipts and Rand-McNally road distance calculators to check the computer MPG calculations and they were within .1 MPG of each other. On that trip, we cruised at 70 to 80 quite a bit, with the AC on.

3.5L
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Old Aug 23, 2012 | 04:06 PM
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I find my trip computer to be fairly accurate as well. I run the numbers in my head at each fill up. I think for the most part the computer is within 0.5 to 1 mpg.
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Old Aug 27, 2012 | 11:49 AM
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From: Charlotte
2012 C63; 2011 E350 Coupe
MPG

Originally Posted by 3.5L
Just returned home today from a 4325 mile trip through the northwestern states. Trip computer indicated exactly 25.0 for the entire trip. For the past few days it had been hovering at 24.9, but it bumped to 25.0 today when we averaged 25.7 on our last leg home.

Yesterday, we logged 27.9 on the leg from Boise, ID to Winnemucca, NV.

Now I'm left wondering why the EPA highway rating is only 21. 4325 miles isn't exactly a short trip, so I think our 25.0 MPG is very realistic.

3.5L
400 mile trip last week. Combo of interstate and 2-lane.
Averaged 23MPG. A/C on full time. I'm OK with that.
Got 30MPG on my C-300 earlier this year w/o A/C on

Last edited by NCBob; Aug 27, 2012 at 11:50 AM. Reason: Add a line
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