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  #11  
Old 01-02-2013, 02:37 PM
jb502 jb502 is offline
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Quote:
Originally Posted by RamTech View Post
Aftermarket tuners off more programming options for these trucks than Chrysler. They only offer programming options for he factory tire sizes. If the dealer did reprogram it, they likely used the largest tire option available to them and got pretty close to it.
well, can you recommend one that I could buy?
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Old 01-02-2013, 03:59 PM
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Most any gps unit can show you if the speedometer is correct or not.

As far as mileage improvement, would think it would improve in the next couple of tanks. But the larger tires that are more off road in design take away on average 1-1.5 mpg highway in the best of conditions. Have never put tires like that on a truck, usually stick with LTX Michelins as am not off road that much or on purpose anyway.
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Old 01-06-2013, 02:43 PM
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i may have figured it out.....or, at least part of it. Dealership put PSI at about 38 on my tires. Sidewalls says max load 80 psi cold. After looking around on the net, I see that most say to put them at around 55-60. This will probably make a huge difference I think. Gonna go air them up. I'll find out tomorrow on my drive to work.
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Old 01-06-2013, 03:06 PM
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My 2012 went from using 14.5 - 15 L/100KM when new. After a couple thousand km now it uses 12 - 12.5 l/100KM. Winter time has hurt my mileage quite a bit! Around town now is over 16L/100KM
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Old 01-06-2013, 03:39 PM
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When I got my '12 last January, my mileage sucked. 12mpg in town and 15 on the highway. Then I put 33" Terra Grapplers on and it went down slightly. By the time summer rolled around, the summer gas blends were here, my truck was broken in, the mileage went up to 17-18 on the highway and 13-15 in town.
Mileage went back down when I put on 37" Trail Grapplers and a 6 inch lift. About 9 in town and 13 highway.
Then I did a S&B CAI and a Magnaflow muffler and mileage went up a little. The biggest increase was getting a diablo Trinity t1000 tuner. At the 87 octane tune, my mileage is 13-15 in town and 17-19 on the highway...and those numbers are on winter gas and cold temperatures. Summer will be better!

Short answer: lots of variables affect gas mileage. Best change for me was the tuner. 2nd best was the air flow(i.e. CAI and Muffler).
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Old 01-07-2013, 02:54 AM
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Default Engine break-in no longer overly relevant

You know the metallurgical understanding of all modern metal alloys these days, precise casting, exacting CNC output and modern engine plants makes a "break-in" period somewhat trivial.

Certainly no reason to REDLINE a new engine at first drive, but the parts are all seated and content in 500 miles.

Engines with factory fill synthetic oils are already conditioned, as there is virtually no engine wear with synthetics.

YOu won't see a significant increase in mpg due to engine break in.

It's your tires they are huge and heavy and some air drag.
Those so called "oxygenates" in the fuel, winter blend etc, there is still the same appx amount of stored chemical energy.
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Old 01-07-2013, 11:00 AM
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Well, i set my fronts at 55 and rears at 50. They were set at around 35. I reset my mpg guage before I left for work. Its only about a 25 mile drive, but the gauge was at 16.8 when i pulled into the parking lot. Best I got before raising psi was 13.7. Still not where i wanted to be, but much much better. I may raise the psi up to 60 front, and 55 rear and see what that does.
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Old 01-07-2013, 01:25 PM
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My MPG sucks. I did have mine built to tow. Lt tires 3.92 with LS rear. In town around 8, I went on a drive mostly 55 on country roads got around 14. 1st trailer 6 x 12 enclosed around 11. Now with my new 8 x 18 enclosed 8 mpg. I understand the bigger trailer has more wind resistance but I thought it would be a little better.
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Old 01-08-2013, 12:55 AM
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Quote:
Originally Posted by ValleyRacer View Post
You know the metallurgical understanding of all modern metal alloys these days, precise casting, exacting CNC output and modern engine plants makes a "break-in" period somewhat trivial.

Certainly no reason to REDLINE a new engine at first drive, but the parts are all seated and content in 500 miles.

Engines with factory fill synthetic oils are already conditioned, as there is virtually no engine wear with synthetics.

YOu won't see a significant increase in mpg due to engine break in.

It's your tires they are huge and heavy and some air drag.
Those so called "oxygenates" in the fuel, winter blend etc, there is still the same appx amount of stored chemical energy.
I know my 2009 got 1.5-2 mpg better on fuel around 8,000 kms.
500 miles is only 10hours of run time on most engines. Valve guides, cam bearings, main and rod bearings will still be plenty tight.
Breaking in on a Dyno, maybe but cruising the streets, no way.

This precise casting and cnc machining you talk about is laughable. Assemble an engine with mid-high end parts, and bearings and tell me how "exact" they are.

However big tires low psi will hurt mpg big time.
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