Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles? - Jeep Garage - Jeep Forum

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Old 08-20-2015, 08:23 AM
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Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

Has anyone on JeepGarage gotten 700+ miles on a tankful? Or even 800 or 900? Theoretically it's possible. The tank size is 24.6 gallons. If we nominally use 23 gallons then these are the possible distances we can go on a tankful:

460 miles @ 20mpg
575 miles @ 25mpg
690 miles @ 30mpg
805 miles @ 35mpg
920 miles @ 40mpg

I am planning a trip and may see how far I can go on a tankful. I think I can get 800+ miles. Trouble is, at only 50 or 60 MPH it takes FOREVER to get anywhere. The real test will be on my patience!

Hypermiling - who's done it and how far have you actually gone? Who has hypermiled their WK2 CRD? Other CRD owners (non-WK2), your results are also welcome but be sure to mention what Jeep you drive.

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Old 08-20-2015, 11:04 AM
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Just completed a trip from Bethlehem, PA to Nashville, TN. I was able to make it to the other side of Knoxville, TN on one tank of fuel, approximately 720 miles on one tank of fuel. I averaged 3-5 mph over the speed limit.
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Old 08-20-2015, 11:20 AM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

Obviously, speed kills here. If you could find a 45mph road you could probably run it 900 miles. Also, I think a stripped down 2wd limited would be the lightest model with the most potential for extreme mpg.

Also, temperature could play a role. I don't think triple digit temps are conducive to hypermiling.
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Old 08-20-2015, 11:46 AM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

Negative temps negate any mpg gains you could hope to achieve. Outside air temps above freezing are the best way to achieve positive outcomes. Personally - the best I've seen was 728 bladder busting miles on one tank.


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Old 08-20-2015, 03:47 PM
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I'm waiting for all the new owners to discover the joys of winter and the fuel economy/mileage effects they will get from using #1 Diesel (or a winter blend of #2/#1) in addition to the bonus of low ambient temps.

Trust me, guys, you won't believe the difference!
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Old 08-20-2015, 03:54 PM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

It's not as bad as your alluding too - low 20s is still realistic with highway cruising on a #1/#2 blend, much better than a straight #1 tank - which would still be better than a tank of JP4.


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Old 08-20-2015, 04:03 PM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

Meh, I typically get 8.5 L/100 km in the summer on #2 while driving under the speed limit on flat midwestern interstates. Winter driving in the EcoDiesel becomes amazing, especially around town... I get 16 to 14 L/100 km usually, provided I don't drive too aggressively and coast when I can. Driving the same patch of interstate during the winter at the same speed as the summer will net me 13 to 12 L/100 km on winter blend. Worse if it's really shitty weather, of course.

YMMV (haha).
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Old 08-22-2015, 11:09 AM
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I've seen a few tanks of hand calculated 34mpg for summer driving.

My winter mileage hand calculated was at it's worst 26mpg with driving in freezing temps with heavy snow.
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Old 08-30-2015, 11:15 PM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

I'm 4x2, been up to 750 miles on a tank once.

Normal suburban driving I'm getting 26 mpg 600 miles on a tank.


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Old 08-31-2015, 12:54 PM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

I recently noticed over the last 2000 miles that my miles per gallon have stepped up a couple miles per gallon. I think now at 28K miles that is do to the engine being fully broken in. At 80 mph I have gone to getting 29 mpg without a strong headwind.'

I owned a Super Duty before this and the mileage jumped up but not until I had close to 60K miles on that 7.3L engine.

Curious to see if others have noted the change in mpg based on engine break in...
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Old 09-02-2015, 09:11 AM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

Quote:
Originally Posted by fun2drive View Post
I recently noticed over the last 2000 miles that my miles per gallon have stepped up a couple miles per gallon. I think now at 28K miles that is do to the engine being fully broken in. At 80 mph I have gone to getting 29 mpg without a strong headwind.'

I owned a Super Duty before this and the mileage jumped up but not until I had close to 60K miles on that 7.3L engine.

Curious to see if others have noted the change in mpg based on engine break in...
Not yet. I'm at 21,000 miles, so still not fully broken in.
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Old 09-02-2015, 04:18 PM
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Re: Hypermiling the Diesel JGC: Max Range, 700, 800, 900 Miles?

Does it really take that long to break in a diesel?
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