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  #49  
Old 09-28-2014, 09:04 AM
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Re: Eco Diesel Mileage

I'l take it.

I would say about 100 miles of that is stop and go. I hit traffic arriving/leaving San Antonio and or arriving/leaving Houston.
I run about 85-90mph on i-10 when it opens up, the mpg takes a bit of a hit up in this range.

Additionally, when I get to my destination in San Antonio, I do make a few runs for lunch/store and a short back and forth from Hotel to work site a few times. All surface streets.

I'll admit, I don't drive the truck like there is an egg between my foot and the go pedal. I really love the way this vehicle pulls from 60-80mph

I'll take 27 mpg considering the way I drive, the weight of the truck, and an AWD platform.

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  #50  
Old 09-28-2014, 10:42 AM
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Eco Diesel Mileage

I did 40mpg avg on Eisenhower 290 into Chicago (old post office) from elmhurst. On a Saturday with low traffic, average speed was around 55mph. When you're over 70mph mpg takes a serious dump.


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  #51  
Old 09-28-2014, 10:49 AM
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Re: Eco Diesel Mileage

I can get an average of 36-37 at 65mph


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  #52  
Old 09-28-2014, 04:53 PM
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Re: Eco Diesel Mileage

Only had the 4x4 Laredo for a weekend and managed to get 7.5lt per 100km over a 950km trip, still have a few hundred left in the tank.

Mainly main roads with only 40kms on a muddy track.
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  #53  
Old 09-28-2014, 06:07 PM
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Re: Eco Diesel Mileage

I've had an Overland CRD since may, just completed a trip to Canada and it's a terrific road trip vehicle. 27.8mpg on the way up, 28.2 on way back. I used ACC mostly, set at 78 or 79. Some two lane driving was included.

So far so good, other than the silly shifter I couldn't be more impressed thus far.
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  #54  
Old 09-29-2014, 12:40 AM
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Re: Eco Diesel Mileage

West TN to Cleveland non-stop.

Avg speed 63.03 mph. Idling for 10 miles of traffic jam on I-65 took 50 minutes to clear. I tried to maintain 78 mph except in Ohio where I ran 70 mph. Construction in Kentucky rerouted me through 45 mph stop and go for 40 miles.

Avg temp 68F. Tires at 38 psi. Terrain was rolling hills mild enough to never downshift for 70%. Flat for the remainder. A on the whole way.

Full at departure, refilled 22.3 gal and traveled 678 miles from fillup. 8 miles before I reset the trip meter. 30.8 mpg.

The EVIC is off due to the 300 mile rolling average since the traffic jam, construction, and detour was in the first 300 miles.
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  #55  
Old 09-29-2014, 09:00 PM
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Re: Eco Diesel Mileage

Quote:

Full at departure, refilled 22.3 gal and traveled 678 miles from fillup. 8 miles before I reset the trip meter. 30.8 mpg.

The EVIC is off due to the 300 mile rolling average since the traffic jam, construction, and detour was in the first 300 miles.
Is that with the latest flash? Still sounds like good numbers.
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  #56  
Old 09-29-2014, 10:19 PM
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Re: Eco Diesel Mileage

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Originally Posted by Jeep_GC View Post
Is that with the latest flash? Still sounds like good numbers.
Yes. My Jeep has all the latest engine and transmission flashes...well, at least it was 2 weeks ago. I think a transmission relearn TSB just released.

The new transmission TSB won't (can't) affect economy on terrain that doesn't require downshifting from 8th gear. The loss in economy occurs at lower speeds under load or when going up steep grades because the threshold of engine demand to trigger an upshift or hold a higher rpm longer is reduced. Now the drivetrain downshifts sooner on demand.

Peak efficiency for a diesel is at or below the rpm where peak torque occurs...around1800 rpm for us. Downshifting revs the motor to 2200 rpm or more and reduces economy.

Look at the bright side...EGT is reduced which is better for the turbo and exhaust.

I'm in Cleveland now. Thursday I make the return trip. If I don't hit a traffic jam or obstruction, I'm expecting 32-33 mpg at 75 mph average...if my bladder holds out. The Jeep goes all the way without refueling.
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  #57  
Old 09-29-2014, 11:07 PM
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Re: Eco Diesel Mileage

Finished a 6,000 mile road trip from Portland, Ore. to New Orleans and back. Most of those miles were on rural highways at 75-85 MPH where the speed limits ranged from 70-80 MPH. Average mileage by hand calculations was 29.2 MPG.
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  #58  
Old 09-29-2014, 11:38 PM
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Re: Eco Diesel Mileage

Notice that the gassers have been quiet lately as our diesels are proving that they easily exceed the EPA estimates without babying them. I suspect terrain and/or overly agressive driving style are the main reasons a few are under performing. They would get poor mileage in a gasser as well. The laws of physics apply. That's not a criticism, its a choice...my wife can't break 13.5 average mpg in her 4.7L GC 4x4 but she likes to drive that way....hard on the gas, hard on the brakes, and tailgating anyone in her way. When asked, she says she is a normal driver.
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  #59  
Old 09-30-2014, 03:11 PM
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Re: Eco Diesel Mileage

Just drove 850 miles from Indiana to the east coast in one day.
30.9 EVIC mpg including 80 MPH most of the way,and 45-60 min in traffic jams around NYC.
Overall couldn't be happier....


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  #60  
Old 09-30-2014, 03:18 PM
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Re: Eco Diesel Mileage

Quote:
Originally Posted by ExcursionDiesel View Post
Yes. My Jeep has all the latest engine and transmission flashes...well, at least it was 2 weeks ago. I think a transmission relearn TSB just released.

The new transmission TSB won't (can't) affect economy on terrain that doesn't require downshifting from 8th gear. The loss in economy occurs at lower speeds under load or when going up steep grades because the threshold of engine demand to trigger an upshift or hold a higher rpm longer is reduced. Now the drivetrain downshifts sooner on demand.

Peak efficiency for a diesel is at or below the rpm where peak torque occurs...around1800 rpm for us. Downshifting revs the motor to 2200 rpm or more and reduces economy.
Good to know. In my case there would be few hills and only towing light loads >2000lbs so it hasn't scared me to ordering a gasser just yet
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