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  #1  
Old 02-05-2014, 03:51 PM
jrichard jrichard is offline
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Default 2013 2500 mpg

I recenly test drove a new 2013 Ram 2500 crew cab...The truck had a 6" lift and 35" tires installed by the dealer..All they had done was recalibrate the speedo to compenstate for the tires...I got out on the hwy at once at 70 I reset the mpg....it averaged 11.6 over a 5 mile stretch...Im wanting to swith to a diesel for pulling my RZR and Bassboat...I get 8-9 mpg towing with my 2010 Z71 with 33" tires...I have been told that a good programmer for the cummins would get me around 16 on the set up listed above...Just want to see what you guys are getting with your before I drop 40k on a truck....
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Old 02-05-2014, 05:20 PM
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First off, the lift and larger tires are hurting the fuel mileage quit a bit. Also 70 mph hurts the mileage also, these trucks catch a lot of wind and the faster you drive, the worse mileage you will get. As far as what fuel mileage you would get, I can't say on a newer truck. I have a 2004, 4 wheel drive, auto, with 4.10 gears and average around 15 mpg mixed driving.
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Old 02-06-2014, 06:22 PM
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Sounds about right, couple that lift with some big wide tires and possibly a 3.73 gear ratio, and you are looking at the ability to only get 11.5-12 mpg. A programmer will give you more, but not much. I doubt you would ever see more than 15-16mpg on a good day.

Also, remember with these trucks, wind speed and direction has A LOT to do with fuel economy. If I have a headwind in my 1500, you can forget it, I will get 15-16 all day. If I am traveling with the wind, I am in the 20's.

I will say though that with a diesel, your in-town mileage will definately be as good or better than the average you posted.
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Old 02-06-2014, 09:20 PM
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There really aren't any tuners available for the 13+. BullyDog does have an unlock that you can purchase for the PCM, but it's not cheap. http://www.bullydog.com/product.php?ID=472
Then you can buy there tuner, but I haven't heard of anyone that has gone that route yet.
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Old 02-07-2014, 01:36 PM
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Exactly what NWRQC said, there aren't any tuners available for a 2013+ Cummins yet. Now that being said, that truck will get way better fuel mileage then that once it's broken in. With the DEF system the MPG of the Cummins has increased quite a bit. You can't compare it to the 10-12 Cummins. I've seen a number of guys getting 18+ MPG on the highway empty and towing some guys are getting 10-12 MPG. But the numbers you'll see depends a lot on your driving habits and styles as well.

I also wouldn't trust the EVIC even if the dealership did calibrate the speedo. For one I would bet they didn't actually drive the truck around enough to verify that the speedo was correct. Plus I just don't trust the EVIC for hard numbers... hand calculating is the only way to go.
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Old 02-14-2014, 06:03 PM
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I have a 2013 2500 Mega Cab with a 6" Fabtech lift, 22" Wheels with 37" Nitto Trail Grapplers and I am averaging 14 MPG's daily with about 50% Highway and 50% in town driving. As stated above, the wind direction and speed have a lot to do with it and depending on the gearing it will have "sweet spots" when running on the highway (for example: I get better fuel economy below 70 MPH or between 77 - 82 MPH than @ 70 to 77 where it seems to drop 1-3 MPG with my set up). I have not pulled anything very heavy with it other than my car on a car hauler and didn't notice the MPG to change very much, But it is a huge difference from pulling with a gas!!!!!

Here's a pic
[IMG][/IMG]
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