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  #13  
Old 05-27-2014, 03:17 PM
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Re: First Long Trip MPG Results

Tires at 40 (cold) with no load? After highway warmup at speed, that must lead to 43 - 44?

Won't that lead to center tread wear, and thus shorter tire life?

What's the consensus on best unloaded JGC tire pressures?

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  #14  
Old 05-27-2014, 06:18 PM
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Re: First Long Trip MPG Results

Quote:
Originally Posted by ExcursionDiesel View Post
Is your GC diesel beyond 5k miles yet? I would expect closer to 30mpg @ 75mph constant speed, cruise set, unloaded on flat ground.
The best 100 mile average have gotten with the WK2 EcoDiesel is 28.9 mpg, going 63 MPH on flat highways. At interstate speeds with cruise control I find the diesel is indistinguishable from the 2013 V6 pentastar: I consistently average ~24 mpg driving at 76 MPH (summer, Great Plains terrain) with both. I have never had a manually calculated tank average on the diesel break 25 mpg.

I have been running the diesel's tires at 40 psi cold, but I will probably back that down.

I'm right at 5k miles on the diesel, but I'm not holding my breath for it to improve.
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Old 05-27-2014, 06:36 PM
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Re: First Long Trip MPG Results

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Originally Posted by GunnySpook View Post
Tires at 40 (cold) with no load? After highway warmup at speed, that must lead to 43 - 44?

Won't that lead to center tread wear, and thus shorter tire life?

What's the consensus on best unloaded JGC tire pressures?
I wouldn't expect a lousy 1 pound to make a lot of difference.
I run at 39 all the way around measured with a digiguage that matches the EVIC more than I'd have expected.

If the Latitudes wear a bit sooner than normal, they'll be replaced with M+S/2, where those will easily run 60-70K at 39 psi, even on high speed jaunts across Death Valley and warmer places.
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  #16  
Old 05-27-2014, 07:24 PM
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Re: First Long Trip MPG Results

I agree 1 pound won't make any significant difference, but would you agree that 40 is a fair step from the 33 posted inside the driver's door by Jeep?

Now I would also agree that Jeep is trying to project a "passenger comfort" position and soft ride with the 33, but that then leaves open the question of what the optimum *true* tire pressure should be.

And that's what I am trying to determine, leaning on the experience of others, without trying to "reinvent the wheel [pressure]" myself.
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  #17  
Old 05-27-2014, 08:18 PM
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Re: First Long Trip MPG Results

Tom,

I've run 36psi (COLD) all around on mine since new and it handles just great, the ride is good plus I'm also getting excellent highway mileage. When it is hot, I've seen it hit 40 on the EVIC. I even saw 33mpg at 65 in CA "on the flat" for a few miles.
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  #18  
Old 05-27-2014, 08:34 PM
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Re: First Long Trip MPG Results

We must think alike, Phil - I run 36 also currently. No complaints, but it always helps to recalibrate!
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  #19  
Old 05-28-2014, 12:37 AM
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Re: First Long Trip MPG Results

Are you guys with lower mpg burning biodiesel?
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Old 05-28-2014, 08:12 AM
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Re: First Long Trip MPG Results

FYI - Regarding BioDiesel.

Anyone shopping at Pilot/Flying J should be aware that they use B20 in their "retail" gas pumps - in quite a few states.

I noticed this in Texas and then discovered that it is pretty typical. You should check on their website before taking road trips!!
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Old 05-28-2014, 08:51 AM
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Quote:
Originally Posted by philbytx View Post
FYI - Regarding BioDiesel.

Anyone shopping at Pilot/Flying J should be aware that they use B20 in their "retail" gas pumps - in quite a few states.

I noticed this in Texas and then discovered that it is pretty typical. You should check on their website before taking road trips!!
The fine state of IL allows up to 20% without telling you what the ratio is. I've seen up to 2 mpg lost when filling up in IL.

My Summit Diesel pulls off 28 to 32 mpg from week to week on tank fulls. I keep my Nokians at 39 psi cold and see them inflate to 42 psi when warmed up.
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  #22  
Old 05-28-2014, 09:13 AM
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Quote:
Originally Posted by ExcursionDiesel View Post
Are you guys with lower mpg burning biodiesel?
No, I have never run anything but pure petrodiesel. My stations said they switched over to summer blend back in March.
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  #23  
Old 05-28-2014, 10:16 AM
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Re: First Long Trip MPG Results

I run 40 PSI HOT. Not sure what that equates to cold as it depends on where you live and ambient temp. I normally don't rely on COLD pressures b/c of variance - I guess racer mentality.

However, when I do tow I will bump up rear wheel PSI to 42-43 psi HOT to help with the additional load.
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  #24  
Old 05-28-2014, 10:21 AM
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Re: First Long Trip MPG Results

Quote:
Originally Posted by Roadkill View Post
No, I have never run anything but pure petrodiesel. My stations said they switched over to summer blend back in March.
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 know that's a lot but economy is affected by many variables that have to be controlled to compare. If your vehicle won't achieve similar results, you may consider a trip to the dealer.

Sorry for hijacking this thread.
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