GLK-Class (X204) Discuss the upcoming GLK-Class. Models include GLK 350.

Mileage Claims

Old 01-29-2015, 05:34 PM
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14 GLK 250 BT
Perhaps then it needs to be said that diesels (specifically MB GLK 250 BT) once one knows how to achieve results has a WIDER RANGE of MPG than say the MB GLK 350 (gasser, I do not know what is happens to be.)
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Old 02-02-2015, 07:27 PM
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Originally Posted by 107123210 View Post
Buckeyesoldier posted this in another thread:

Well, I just completed a trip from Ontario, Canada to SC - about 1000 miles. We drove at the most 10% over posted speed limit on I-81 (55-70). GLK250 was full, but not heavy stuff and there was just the two of us. We has Thule box on top, but fuel consumption was about same as for same trip last year without box. 27-28 mpg on car computer and by calculation. Car has done about 7800 miles.

During summer, our mileage was at best 35mpg.

So how do others get 40+ mpg with same vehicle? I can't see any way of achieving that regardless of how we drive. Our V-6 E320 gasser did just as well.
Your now driving a brick
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Old 02-02-2015, 07:42 PM
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Originally Posted by 107123210 View Post
My figures are in US mpg (same as GLK display). In Imp mpg, my figures are 32-42 mpg. But the figures most post here are in US mpg, and that is what I was questioning.

Some question the way we drive. On a trip like the one described in post #1, it is hard to imagine many driving more conservatively. We have GLK on cruise control and maintain speed of other traffic, which is usually about 10% over the posted speed limit. The section from Canadian border South to Virginia is quite hilly. We did see an improvement in mileage once through that, but still we couldn't get better than about 29 mpg.

On trips from our home in Kingston to Toronto Ontario, we achieved 35 mpg at about 120km/hr or 74mph. But that is in summer with no roof box or bikes on hitch mount. Also less load by about 200 lbs.

I still just can't see how those higher figures could be achieved on my car. There must be a difference in settings or in the energy content of the fuel.

With the higher cost of diesel vs reg gas, a Subaru Outback or similar gasser might have better economy.
My ML BT does better most of the time at 127 KM/hr too slow works against gearing and terrain. Alternately about 105 or less is good but not below 90km also in town about 60kmplus or the gear choice eats fuel at 50klm/30mph it I use distronic fuel usage is up because of traffic... just my results
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Old 02-03-2015, 09:45 AM
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GLK250 2014
Originally Posted by twinturba View Post
Here is the data as calculated on Fuelly for both tanks of gas from my two trips so far this year, both with the cargo box on top, just above 33MPG average.
# Date Miles Gallons MPG Price Note
21 1/16/15 518.70 15.49 33.48 3.099
20 1/4/15 512.70 15.48 33.12 3.190

One of the trips had stop and go traffic all the way up to Tahoe, but both trips were fairly free flowing traffic on the way back. They both include all street driving in and around Tahoe for three days each and an average of two "pitstops" for food and restroom breaks each way. The trip computer Usually reports a little higher than the actual calculated numbers on Fuelly.
After a couple of weeks of local driving in SC, I am getting almost the same mileage as twinturba above. About 32mpg with 30/70 city/hwy. Hwy actually relatively flat city bypasses we use a lot. Speed about 60-65mph. This seems fine and in line with epa numbers.

I have tried driving very conservatively on several trips and can't for the life of me see how I could ever get 40mpg or more as some have posted. Maybe only if it was downhill all the way
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Old 02-03-2015, 10:01 AM
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'85 190D , '12 E350 BlueTec, '13 GLK 250 BlueTec
Originally Posted by 107123210 View Post

I have tried driving very conservatively on several trips and can't for the life of me see how I could ever get 40mpg or more as some have posted. Maybe only if it was downhill all the way
I wouldn't have thought so either but being forced to drive 50 mph while using an inflatable spare, I got near 48 mpg on the GLK250 across the state of Wyoming.

In virtually all 'local' conditions, which includes limited freeway, lots of curvy mountain roads and relatively short 'trips', I get 32 mph. Highway at speeds under 90 mph I consistently get just under 36 mpg.
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Old 02-07-2015, 08:57 AM
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I read most of the posts here and scanned other posts regarding mileage. I am somewhat amazed that the mileage numbers many of you are achieving seem to disappoint or at least underwhelm. The numbers I seem to consistently get are very close to what I see being posted here. I am quite amazed and pleased with my 34-39MPG. I have a vehicle with room for five, a relatively large cargo area, secure 4matic drive train (when considering the amount of rain here) in a German made UV that costs little more than a loaded KIA or Ford. The dealership I bought from has also amazed me with their level of customer service. As quality rides go, I would find it difficult to find an equal. I looked at Audi TDI as well as the BMW oil burner, and dollar for dollar, the MB came out ahead (at least for my needs). Having also owned a V10 Toureg (Talk about a beast) a Golf tdi (going strong at 216000 miles) I have seen the performance side and the economy side of diesel ownership. This GLK250 is the best of both worlds.
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Old 02-12-2015, 03:21 AM
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2014 GLK250, 1983 Caterham super 7
Another thing that folks need to be aware of is that refineries change to a winter diesel formula. This formula has a lower cetane level because of the addition of #1 fuel to the #2 summer fuel to prevent gelling and will normally result in a bit lower fuel economy.
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Old 02-13-2015, 10:31 AM
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[GLK350 2010]

END of JANUARY 2015 @ 46K MILES.
I'm new to the forum and never owned a Benz before. I'm buying a used GLK for 21,500 USD. it is approximately @46,000 miles, the last time it was serviced was @43,000 (according to the previous owner). this is my first Benz, I'm looking forward it lasting me a while and ill do my best to maintain this car. any tips advises? i drive to work every day, i drive about 4,000 miles a month. I'm thinking about doing oil changes every 15,000 miles. I will also be using Mobil 5W-40 FORMULA M. what do you guys think? any tips on getting it to last longer? my goal is to have the highest mileage GLK. ill update my my mileage and how much i spend on the car. stay tune guys and ill be looking forward to your guys responses.

I yelped the best reviewed Mercedes Benz Repair around my area atm and decides to take it to Powerhouse German Automotive[15195 Moran St Westminster, CA 92683] for Service A and buff out someone keyed my baby after some public appearances. (some jealous person... probably drives a ford or something). This is the first time I brought it to the mechanic under my possession even though I should've got it checked out before I purchased it off of craiglist.. haha I'm ashamed I'm also currently doing a Techron Fuel System Cleaner treatment, I wanted REDLINE S1 but couldn't find it in store, I'm going to order that on amazon along with a lot of other products that I'm bringing to [] @60K MILES, my friend works here.


I'll be selecting my own products to use on my benz on this service, I read a lot of good things about Royal Purple and decides to use most of their products for my fluids. The following products is what I'll be using on my benz until I find something better I suppose. Any comments about them ?
- Royal Purple 05540 SAE 5W-40 RP Series Oil - 5 Gallon Pail
- Royal Purple MAX ATF Synthetic Transmission Fluid Oil 12 Qt. 01320
- Mann Filter (CUK 29 005) Carbon Activated Cabin Air Filter
- Royal Purple 01326 Max EZ High Performance Synthetic Power Steering Fluid - 12 oz.
- Mann-Filter HU 718/5 X Metal-Free Oil Filter
- TYC 800129C2 Mercedes Benz Replacement Cabin Air Filter
- OES Genuine Coolant/Antifreeze 1 Gallon
- Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.
- Pentosin (BF-DOT4-1000ML) Brake Fluid - 1 Liter x 2
- Red Line (60103) Complete SI-1 Fuel System Cleaner - 15 Ounce
- Rain - X Latitude WIPERs
- Wagner ThermoQuiet MX1341A Semi-Metallic Disc Pad Set, Rear
- Wagner ThermoQuiet MX1406 Semi-Metallic Disc Pad Set, Front
- Hengst Fleece Oil Filter Kit

Did you guys ever heard of the mileage award they have with Mercedes?

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