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  #1  
Old 01-02-2016, 02:34 PM
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higher speed cruising effect on diesel

I just did a 1500 mile trip over the holidays with my 2014 Diesel, very pleased with the Jeep all the way. I did a day trip up into the NM mountains and had a chance to finally try out the Snow setting (but plenty of snow and melt was waiting in El Paso on return, oddly). Temps dipped to the teens so I added some anti-gel, winter mix didn't appear at the pumps that I saw.

All went well, but while heading home down I-10 (posted limit mostly 80 MPH), my wife was driving and I noticed she had the GC up near 95MPH. I had her cut back to 85 or so like I'd been doing (seemed like plenty and I was working on a good mileage average challenge, made 28.5).

I really don't know what is a good range of cruising speeds or what the effect of higher speeds is on this diesel motor, I only know the tractors of my youth or the humvee and deuce and a half of my Army days. Not speed demons any...

Anybody have some knowledge to share? I feel like I'd drive the Hemi like crazy but what about this diesel? I have about 20K miles on it. Maybe I'm just babying it...

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  #2  
Old 01-02-2016, 03:10 PM
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Re: higher speed cruising effect on diesel

We regularly run I-10 from Kerrville to points west. When towing, we keep to 65 but when we have just the Jeep, we run 85+. It just loafs along at those speeds. IIRC, you are around 2300RPM at 85...no sweat!
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Old 01-04-2016, 09:17 AM
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Re: higher speed cruising effect on diesel

During a road trip last spring I went from San Francisco to Phoenix to Grand Canyon to Las Vegas and back to SF. About 2,000 miles of mostly open interstates 5, 10, and 40, while going through some mountains. I cruised at 80, 90 and at times 100 and the car barely breathed hard and kept its engine and trans temps decently low. I was happily impressed.
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Old 01-06-2016, 08:55 AM
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Re: higher speed cruising effect on diesel

My previous diesel jeep (WK CRD) would see 2,600 RPM just at 70 mph (it had the SRT8 5 speed transmission as the standard Hemi transmission at the time either could not handle the diesel's torque or it wouldn't mate to the 3.0 crd engine). I loved it but the extremely high RPMs driving a 65-70 mph speed limit was cringing at times. When I towed with it - it never downshifted to go up even through I-70 in Missouri where there were some steeper climbs.
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Old 01-06-2016, 11:40 AM
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Re: higher speed cruising effect on diesel

Just did a run down Interstate 10 at 75mph. RPM's were at 2000, right in the meat of the torque curve !
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Old 01-07-2016, 09:57 PM
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Re: higher speed cruising effect on diesel

Where in New Mexico did you go? Ruidoso? There was a lot of snow in both places!

Sounds like the same same trip my wife and I took over the Christmas break. We went from the Dallas are to El Paso in our 2014 Diesel and did an overnighter in Ruidoso for a quick side trip. We averaged 23mpg going to EP and got 25 mpg coming back. You got a lot better fuel mileage than we did. We have just over 30,000 miles on ours.

We have averaged 30 mpg on trips where we stay in the 70-75mph range. I think the leveling kit and slightly larger tires have hurt us in the mileage.
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Old 01-08-2016, 12:41 AM
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Re: higher speed cruising effect on diesel

Quote:
Originally Posted by JHegge View Post
I just did a 1500 mile trip over the holidays with my 2014 Diesel, very pleased with the Jeep all the way. I did a day trip up into the NM mountains and had a chance to finally try out the Snow setting (but plenty of snow and melt was waiting in El Paso on return, oddly). Temps dipped to the teens so I added some anti-gel, winter mix didn't appear at the pumps that I saw.

All went well, but while heading home down I-10 (posted limit mostly 80 MPH), my wife was driving and I noticed she had the GC up near 95MPH. I had her cut back to 85 or so like I'd been doing (seemed like plenty and I was working on a good mileage average challenge, made 28.5).

I really don't know what is a good range of cruising speeds or what the effect of higher speeds is on this diesel motor, I only know the tractors of my youth or the humvee and deuce and a half of my Army days. Not speed demons any...

Anybody have some knowledge to share? I feel like I'd drive the Hemi like crazy but what about this diesel? I have about 20K miles on it. Maybe I'm just babying it...
Diesels are built strong to handle the combustion and they love to work with all that torque. Don't baby it, drive it like a petrol (sorry gas motor) and it will be fine. Down here is Aus there is no sympathy for diesels. Run them hard in 35-40C (95-100F)temps all the time at 110-120km/h (70-75mph). Not sure if the US model has DPF but we do so they need to be driven a bit harder to burn the soot in the filter so we can minimise the regen process.
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Old 01-08-2016, 04:49 PM
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Re: higher speed cruising effect on diesel

Quote:
Originally Posted by lp967 View Post
Where in New Mexico did you go? Ruidoso? There was a lot of snow in both places!

Sounds like the same same trip my wife and I took over the Christmas break. We went from the Dallas are to El Paso in our 2014 Diesel and did an overnighter in Ruidoso for a quick side trip. We averaged 23mpg going to EP and got 25 mpg coming back. You got a lot better fuel mileage than we did. We have just over 30,000 miles on ours.

We have averaged 30 mpg on trips where we stay in the 70-75mph range. I think the leveling kit and slightly larger tires have hurt us in the mileage.
We drove up to Cloudcroft, NM, our overnight option in Ruidoso, NM fell through.

I think we picked up a terrific tail wind on the trip back home, boosting a bit more. I find it difficult to gauge how the Jeep is doing when the RPMs never seem to move outside 1500 and 2500...
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Old 01-08-2016, 05:05 PM
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Re: higher speed cruising effect on diesel

Quote:
Originally Posted by GCDingo View Post
Diesels are built strong to handle the combustion and they love to work with all that torque. Don't baby it, drive it like a petrol (sorry gas motor) and it will be fine. Down here is Aus there is no sympathy for diesels. Run them hard in 35-40C (95-100F)temps all the time at 110-120km/h (70-75mph). Not sure if the US model has DPF but we do so they need to be driven a bit harder to burn the soot in the filter so we can minimise the regen process.
I'd hoped to get a response from Aus (longer experience with this diesel).

I never drove a diesel tractor nicely but they were giant and slow. I have driven the Jeep hard a few times when regen process kicks on.

Driving at 70-80, always figured that's golden and the Jeep can't be bothered but I was more curious of 85-100. Speed fine but oil life lower? Hard on any other parts?

My friend has an SRT and I thought my spine exited the back of the seat when he laid on the pedal hard with that mutant Jeep but it's built that way. But I like the easy acceleration with all the diesel torque much more.
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