ralphA

I recently did NYC to myrtle beach SC and got about 21 ... going kind of fast.. lol ... coming home i was playing with all the dash stuff and set my trips and one of them was on I-95 in north Carolina av speed was 89 MPH 18.2 MPG (that was 100 mile stretch with the wife sleeping at 6am ) LOL

3.5L

1. Perform a complete wax job (reduces aerodynamic drag).
2. Inflate tires to max allowable (lowers rolling resistance).
3. Never exceed 55 MPH, except when coasting down hills.
4. Draft trucks and other large vehicles (NASCAR training required).
5. Avoid hills. Only drive downhill.
6. Do not strap dog or other items to roof rails. This increases aerodynamic drag dramatically.

There you have it.

3.5L

venchka

5a. Always drive downwind.

We may be using more fuel, but our intake valves will be clean.

Wayne

3.5L

I finally got it! The 21 to 22 highway MPG rating is at 100 MPH! MB and EPA kept it a secret!

3.5L

3.5L

And to think I've been worried sick about my intake valves, obviously for no good reason!

3.5L

venchka

I expect the 2013 GLK to come with the Direct Injected 3.5 liter engine. The jury is still out on long term valve life in that engine. New ain't always better.

Wayne

bop11

At those speeds in the Carolin's, you might meet some "good ole boys" but I got a cousin Vinny who may get you out before you become the Quintessential Ralph

3.5L

That must be Vinny "You got a problem?" Corleone.

3.5L

rmfnla

Well, yeah; what government agency do you know of that wants you to have any fun..?

Burl

Recent trip from Austin to OKC...with a tail wind we got 27.5. Return trip with a head wind we got 22.7. We ran 70-80 mph most of the way.

jonnyrt

Weekend before last I did a 660 kilometer round trip from Calgary to Edmonton, AB and back. I got 10.4 L/100 km (22.6 MPG) on the highway doing ~120 km/hr. It might sound good, but I was a little disappointed. Having come from a GTI, which used to get 6.9 L/100km highway, I guess I should not be surprised at the GLK. What amazes me is that my folks have a 2012 R350 Bluetec, the vehicle weighs over 5000 lbs and still gets 7.9 L/100 km (30 MPG) on the highway with the diesel!!

chkmte

Just completed trip from San Diego to San Francisco and back, including the lovely passage thru East LA. Avg 24 MPG.

BillsBenz

Just drove Philly area to Nashville and back, 25.5 mpg going 5 mph over the limit. In most parts of I 81 the limit is 70 so that's not bad mostly driving 75.