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Old 05-31-2014, 07:48 AM
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Max MPG? Hypermiling the Diesel JGC

Mine is still new, with two months and 2,800 miles on it. I'm taking it today for its first somewhat-long day trip, 700 miles today, San Jose CA to Ventura CA round trip.

I plan to lock the trans in 8th on I-5 (flat, straight) and see if I can get over 30mpg. I have the 20" wheels and /50 series low profile tires, at 38psi. Not towing today.

(Ventura County Offroad Show, here I come! If you're there and see my white JGC, leave a note w/ your cell #. It'd be nice to quickly mert up and say hello in person. My CA plates are 4WL TREK.
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Guys/ladies, what's your max MPG so far, over some distance?
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Old 06-01-2014, 12:12 AM
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Re: Max MPG? Hypermiling the Diesel JGC

You will get over 30 mpg if its flat, you stay in 8th gear under 2k rpm and your aren't burning biodiesel.

I've gotten 34-35 mpg on 2 lane 60mph trips with no stops or elevation changes in cool weather.
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Old 06-01-2014, 01:34 AM
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Re: Max MPG? Hypermiling the Diesel JGC

Yep, you're right. I got back a little while ago and was able to get 30 MPG on the outbound leg. Then on the way home I got 36 MPG! (okay that was at 55 MPH). But still, that's pretty good...

Details:

==> 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 the stretch is flat and with minor rolling hills.

This was on a 725-mile day today, San Jose to Ventura CA and back. I left this morning at 6:30am and returned a short while ago at 10:30pm.

But, WOW, 30 MPG @70 MPH and 36 MPG @55 MPH -- this is one amazing car and I continue to be impressed by it!
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Old 06-01-2014, 01:38 AM
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Re: Max MPG? Hypermiling the Diesel JGC

Quote:
Originally Posted by ExcursionDiesel View Post
You will get over 30 mpg if its flat, you stay in 8th gear under 2k rpm and your aren't burning biodiesel.

I've gotten 34-35 mpg on 2 lane 60mph trips with no stops or elevation changes in cool weather.
I know your gallons are only 3.79 ltrs but you shouldn't have a problem.
I have achieved 6.3 lts per 100 klms.
Below is a You Tube link.



Elvin
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Old 06-01-2014, 10:18 AM
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Re: Max MPG? Hypermiling the Diesel JGC

Let this be one for the naysayers. As the OP has now experienced, the diesel motor option delivers. Hemi drivability and Pentastar economy. I'll gladly pay $4k for that...or 1.5k over the Hemi.
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Old 06-01-2014, 10:28 AM
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Re: Max MPG? Hypermiling the Diesel JGC

Unfortunately I like to drive fast so I don't get these stellar numbers lol. At 85 MPH with larger off-road tires and a modified front end I get ~23 MPG.

But to put that into perspective if it was the HEMI under the same config/conditions I'd probably get like 13 MPG.
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Old 06-01-2014, 10:58 AM
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Re: Max MPG? Hypermiling the Diesel JGC

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Originally Posted by Zybane View Post
Unfortunately I like to drive fast so I don't get these stellar numbers lol. At 85 MPH with larger off-road tires and a modified front end I get ~23 MPG.

But to put that into perspective if it was the HEMI under the same config/conditions I'd probably get like 13 MPG.
Hey Zybane I'm with you, I like to drive fast, too. If I'm not passing people along the way, then I feel like I'm standing still and not even making progress towards my destination. I have over 250,000 motorcycle miles in me, and that driving/riding style was honed perfectly on my bikes (BMW sport touring and dual sport bikes), where cars are simply pylons to slalom around.

But, I wanted to do these runs to get some data points. The speed limit on I-5 is 70, and even doing just 70 was painfully slow. 55, my gosh, was laughable, but I was in a patient mood and able to do the double-nickel for 200 miles.

On I-5 I usually do 80-85, and push 90-100 sometimes when passing.

But Zybane, I'm curious, what size tires do you run? I want to up-size mine when the current 265/50-20s wear out. Larger tires (more sidewall flex) and offroad tread will negatively affect MPG.
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Old 06-01-2014, 11:03 AM
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Re: Max MPG? Hypermiling the Diesel JGC

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Originally Posted by ExcursionDiesel View Post
Let this be one for the naysayers. As the OP has now experienced, the diesel motor option delivers. Hemi drivability and Pentastar economy. I'll gladly pay $4k for that...or 1.5k over the Hemi.
Oh yes, I'm with you, definitely agree. Not only for the good MPG, but also for the long range, 500 to up to 700+ on a tankful of fuel!

My JGC is only two months old, and this is going to be a nice, long marriage. I'm in my 50s -- could this be the last car I'll ever need and have for the rest of my life? It certainly won't be the last car I'll ever want, that's for sure.
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Old 06-01-2014, 12:57 PM
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Re: Max MPG? Hypermiling the Diesel JGC

Just completed a cross-county trip from Maryland to Montana and back. Here are some quick stats: 5,661 miles through 15 states and partway through one Canadian Province. Used 224.86 gallons of fuel and averaged 27.6 miles per gallon for the entire trip. Tire pressure was 42 psi. Used approximately 1/2 tank of DEF. Oil life went from 76% to 13%.

Best leg: Kalispell, MT to Bismarck, ND with 30.62mpg. That was with the ACC set to 71 on rural roads and 76 on the highway. Saw the evic hit 33 mpg on the rural roads. Got 712 out of the tank before refueling.

Worse leg: Bismarck, ND to Minneapolis with 24.73. Heavy cross and headwinds made that a tough drive. Was averaging 75 for that drive. All other legs were between 27 and 29mpg with average speeds between 70 and 75.

Very impressed with the performance. Drove with ECO on almost the entire time. Rarely moved out of 8th gear except for some steep mountain climbs when it dropped to 7th. That worse leg also saw some slight gear hunting trying to maintain speed.


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Old 06-01-2014, 01:21 PM
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Re: Max MPG? Hypermiling the Diesel JGC

Quote:
But Zybane, I'm curious, what size tires do you run? I want to up-size mine when the current 265/50-20s wear out. Larger tires (more sidewall flex) and offroad tread will negatively affect MPG.
They are: P265/70R18 114S Nitto Terra Grapplers, just under 33 inch. Indicated 80MPH on highway is 85-86 MPH on GPS.
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Old 06-02-2014, 08:07 AM
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Re: Max MPG? Hypermiling the Diesel JGC

Quote:
Originally Posted by ExcursionDiesel View Post
Let this be one for the naysayers. As the OP has now experienced, the diesel motor option delivers. Hemi drivability and Pentastar economy. I'll gladly pay $4k for that...or 1.5k over the Hemi.
I'd revise it to Hemi Power but Fuel Economy of a 4 cylinder cute ute as mine is now giving me low 30's mpg normally highway driving at 60-65 mph (that is Ford Escape Hybrid mileage). Pentastar can't match that.
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Old 06-02-2014, 06:42 PM
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Re: Max MPG? Hypermiling the Diesel JGC

There was a thread on this in the Export diesel forum Real World Diesel mileage

My best fuel economy was on a level stretch, passing through towns etc, at:
5.2 L/100km =53.9mpg = 44.9USmpg over 114km (70miles) 1hr 24min = 81kmh (50mph) avge.. ahh translating to a 1790km (1100mile) range

Wayne Gerdes went from Chicago to Austin on one tank.. he did it at 44USmpg


Overall quite remarkable fuel economy for a vehicle weighing 2440kg/5380lbs (weighbridge weight of my JGC) + ~ 260kg load, Total GVM ~ 2700kg/6000lb

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