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  #25  
Old 05-28-2014, 11:51 AM
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Re: First Long Trip MPG Results

Two weekends ago...I was running the speed limit (sometimes 60MPH and other times 70MPH) a little over 300 miles from Maryland to Ohio on I68 and US 50 in West Virginia. I got 31.1 MPG with (I believe it was) summer fuel. I also have a little over 12K on the clock. It didn't seem to really break in until around 11,500 miles. I believe its a combination of the engine, the transmission and the air suspension that lowers the vehicle during highway speeds. I really like this vehicle its an awesome ride. I used to live in Kansas, I'm sure on a non-windy day I could get a couple of miles a gallon more out there because its so flat.

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  #26  
Old 05-28-2014, 08:26 PM
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Re: First Long Trip MPG Results

I did exactly that in CA on a straight stretch of HWY 5 when we were driving from Monterey to Palm Springs. 33mpg on the nose.
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  #27  
Old 05-29-2014, 09:33 AM
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Quote:
Originally Posted by ExcursionDiesel View Post
The best method I know to determine if your GC is running on par with others is to do a "baseline" mpg test. We have to assume the EVIC is consistent between vehicles so it is relative.

Try this when you get a chance. Air up your tires to near max or max rated on the sidewall. With the engine and tranny at 195F or more, drive with cruise control at 60 mph on a perfectly flat stretch of smooth highway with no wind. Reset your EVIC mpg on one of your trip meters and see what you get after several miles. You should see 33-34 mpg (or better) bone stock with 4WD models. Bigger tires change the rolling friction, overall gearing, and aerodynamics. Fuel quality (Winter blend, Biodiesel), high altitude, windage, and being in regen mode (random, won't know without an EGT meter) all affect mpg on this test.
I did this test last night on my stock 2014 Summit 4wd. Over 15 miles with these parameters I averaged 33.1 mpg.

A few notes:
AC costs more in fuel efficiency than I thought. Several mpg, in fact... I could only get this efficiency with the AC off.

It was a flat stretch of interstate, but I ran up and back the same stretch to try to mitigate any ascent/descent bias.

I wasn't in regen. EGT and Cat temps were 350 to 400 C the whole time.

The transmission actually cooled down during the trial. I guess 60 mph in 8th gear doesn't keep it at 195 F.
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Old 05-29-2014, 11:02 AM
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Re: First Long Trip MPG Results

Not a horribly long road trip for me or anything, but I just did a 250 mile round trip from one side of the cascade mountains to the other around Seattle (from Everett, WA to Leavenworth, WA).

All said and done, on a two lane highway between 60-70mph the whole way, climbing and descending fairly often, I averaged just over 30mpg, which I thought was pretty freaking solid for a brand new 4x4 which is supposed to top out at 28 on paper.
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  #29  
Old 05-29-2014, 12:04 PM
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Re: First Long Trip MPG Results

The EPA test is done on a dyno and has start/stop and speed changes in the cycle. It has always yielded low estimates vs "best case" actual mpg on diesels.

For those of you doing my mpg baseline test, the cool thing is that it improves with break in. Take note of the results and conditions and re-test periodically to make sure everything is good.

Diesels don't need a "tune up" but modern ones do have some sensors and EPA equipment that can effect performance and will lower mpg. Changes in the mpg baseline test can indicate an issue.
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  #30  
Old 05-29-2014, 01:40 PM
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Re: First Long Trip MPG Results

Here’s some info many people don’t know about EPA Ratings. EPA testing is done in a laboratory that means constant conditions with the intent to create even testing between comparable models (not to get actual real world mileage) and in order to account for weight and drag co-efficient they provide friction on the dyno wheel. In addition OEMs may test vehicles themselves under similar circumstances however variables such as altitude, air density, temperature affect results. Even further, OEMs are allowed to create their own EPA mileage estimate even though the vehicle was not tested if the drivetrain is used in a "similar" vehicle (this is done by an algorithm). For instance this latter part is why Ford's C-Max Hybrid had to be derated on MPG due to real world being so far from EPA as the math didn't work out right.


So why does this even matter to us? Well we often rely on #s from EPA especially those looking for fuel economy in their upcoming purchase. EPA doesn't work well here as these tests are not adequate to actual real world driving (traffic, weather, etc.)


I just did a search on Fuelly.com where people can enter real world mpg (though we are relying on strangers one could assume once you get rid of the outliers a good median is useful). So with this in mind - a 2014 WK2 4wd Ecodiesel the majority of folks are getting an average of 25-27 combined mpg, the 2014 WK2 4wd Gas v6 has a majority of 19-20 combined mpg, and the 2014 WK2 Gas Hemi v8 (non SRT) gets an average of combined 17-18 mpg.
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  #31  
Old 05-29-2014, 02:18 PM
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Re: First Long Trip MPG Results

Great post on EPA testing. I suspect the average for the Ecodiesel will rise since the data was primarily winter driving. Even at that, it is already 2-3 mpg better than the EPA combined estimate. The gas models are slightly better than EPA rated also and have a year of data to average.

By the data, it looks like we are averaging 6-7 mpg better than the Pentastar and 8-9 mpg for the Hemi. Not bad...especially considering how strong the 3.0 runs. I get a big grin everyday I drive it.
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  #32  
Old 05-31-2014, 08:22 AM
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Re: First Long Trip MPG Results

jaje, thanks for the info. Mine has 2,800 miles on it and I'm taking it on its first long-ish trip today, round trip, San Jose CA to Ventura CA and back, about 700 miles. I'll measure my MPG.

I'm running 38psi on the 20" tires. They are /50 profile tires.

Oh and thanks for the tip on Urban Chestnut Brewing Company. I go to STL often and will check it out. So far my favorite spot is Pappy's Smokehouse over by SLU.
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  #33  
Old 05-31-2014, 08:37 AM
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Re: First Long Trip MPG Results

I'm heading to the Ventura County Offroad Show, BTW, today and tomorrow in Ventura. If you are there look for my white JGC CRD there, CA plates 4WL TREK, and say hello or leave a note w/ your cell # for a quick meet-up and a quick hello. I'm driving back home to San Jose tonight, so it'll be a long day.

I'll be leaving San Jose in a few minutes to head south.
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  #34  
Old 06-01-2014, 02:29 PM
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Re: First Long Trip MPG Results

I put in 725 miles yesterday driving to Ventura CA (the Ventura County Offroad Show; Ventura County Offroad Show trucks, dirt bikes, toy haulers, camping accessories, apparel, Ventura Fairgrounds, April 20-21 2013) and back home to near San Jose. I got some good MPG results:

— 30 MPG @70 MPH, over a 200 mile stretch, southbound on I-5 between Hwy 152 and the bottom of the grapevine.
The A/C was on the entire time. No cruise control; the transmission was locked in 8th gear.

— 36 MPG @55 MPH, over a 200 mile stretch, northbound on I-5 on the same stretch.
The A/C was on the entire time. Cruise control was used the entire time; the transmission was in Drive, with ECO on.

The tires are 265/50-R20, inflated to 38PSI, cold. My JGC has 3,500 miles on it, so it's not broken in yet. I-5 on this stretch is at low elevation (under 1,000') and with minor rolling hills. It's mostly flat. And boring.

The show was fair, decent, not great. It's their first-ever offroad dhow for Ventura County, reportedly. It was mainly an excuse to take my new JGC out to stretch its legs for its first time.
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  #35  
Old 06-02-2014, 09:10 AM
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Re: First Long Trip MPG Results

Had to drive to Topeka (eco on) and highway at 65 mph and was able to get 34.4 mpg (my best yet). I was taking it easy on the throttle and I usually try not to come to complete stops where I had to slow down for an occasional light. Did have to do 2 passes on a 2 lane road but it never needed to downshift to complete the pass.
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  #36  
Old 06-04-2014, 04:33 PM
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Re: First Long Trip MPG Results

Took a little trip today. It was all 4 lane divided 65 mph with several 45 mph zones and stop lights in towns along the way. The terrain was rolling hills in Alabama. Fuel was from Murphy (Walmart)...100% diesel. I idled for 15 minutes. Didn't notice a regen event.
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