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  #1  
Old 10-30-2010, 03:55 PM
yzracer yzracer is offline
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Default Stock Mileage and how to increase it?

Hey guys,

I'm new here. Been trolling the forums for a little bit because I am planning on picking up a 2010 2500 MegaCab 4x4 with the 6.7L Cummins. After searching and looking I couldn't really find a direct answer to my questions.

I am curious what everyone is getting city, highway, and average running empty and not towing with the 3.73 rear?

Also, what are the best modifications to do to increase gas mileage for both the city and highway? What can the expected gains in mileage be from these modifications? I really like the Cummins but don't know how realistic it would be for me to have a as a daily if I can't get the mileage i'm looking for. So any and all help is appreciated. It's good to be on the boards!
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  #2  
Old 11-23-2010, 02:58 PM
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rsg1963 rsg1963 is offline
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I cannot help you on the 6.7, but I have the 5.9 and can give you basics about these being 'daily drivers'. First thought is that they make better daily drivers than gassers due to mileage improvement. I have a heavy dually with some heavy adds and I get about 16 average in town 19 highway, without my 5th wheel, and about 10-11 with it (it weighs 18K+ pounds on its own). In comparison, my 1500 RAM with Hemi gets about 13 in town, and 18 hwy completely empty and not towing and not zipping from light to light. The Cummings is great around town with its low-low torque. Really nice to zip to the next light surprising the heck out of the trucks/cars next to you that thought they'd get in front easily and not use much fuel to do it. Also nice not having to wind the motor up to get moving quickly like I have to do in my Hemi. Without the extra two tires and without the adds I have, your numbers will be slightly better. All-in-all, I'd get a Cummins as my daily any day over the gassers, and I own both. Keep in mind though that the 6.7 does not get the same mileage as the 5.9, but it shouild ot be too far off.
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Old 11-23-2010, 05:11 PM
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Yeah...My 5.9 2500 gets pretty good i get about 17-18 town and avg 22 on hiway...and thats not driving slow lol.. I cant really help you on the 6.7 but like rsg1963 said it shouldnt be that much of a difference.. and my bf said you could get a chip but it might ruin your trans! Good luck!
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Old 12-29-2010, 08:08 PM
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I've got a 2010 6.7. New in July. Mileage sucks. I get around 13.5 mpg in town and around 17 out on the highway. As of yet I have not towed with it. I would like to get the dpf delete as this seems to be the answer to the restriction on exhaust. Since I have a 4X4, I am thinking about replacing the front axle hubs with manual lockouts so the front differential isn't spinning all the time while I'm driving down the road.
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Old 12-29-2010, 08:21 PM
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I heard that the DFP delete may help some

I worked with a guy 2 weeks ago, he was getting 24 highway
his Ram is the red one, up near the front of this rig, he also has a lot of weight in his Rams bed

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Old 12-31-2010, 12:14 PM
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Quote:
Originally Posted by smokin6 View Post
I've got a 2010 6.7. New in July. Mileage sucks. I get around 13.5 mpg in town and around 17 out on the highway. As of yet I have not towed with it. I would like to get the dpf delete as this seems to be the answer to the restriction on exhaust. Since I have a 4X4, I am thinking about replacing the front axle hubs with manual lockouts so the front differential isn't spinning all the time while I'm driving down the road.
Thats about right for the 6.7 unfortunately. The 5.9 was/is better in this area and with about the same power it's a shame they changed it. I know I'll eventually get a newer truck and hate that I will have to lose my 5.9.

The mods you mention will help, but not a lot. Be ready for that. (but the manual hubs will give you reliability and wear benefits in addition to a bit of fuel saved) Also remember that these 5.9's and 6.7's do not like being wound above about 1800-1900 RPM on the highway before they start killing mileage. Just a couple hundred over that and it starts to drop quite a bit.
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Old 03-10-2011, 10:50 AM
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Impressive MPG I have an 04 5.7 hemi and get 12mpg. Your diesels are impressive MPG have you ever done a comparison of cost (in my area diesel fuel costs more than gas about $.60 more) versus MPG to see which is the better deal? If your getting say 18 mpg versus my 12 mpg it would seem that the diesel is the better cost saver over the gas.
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Old 03-10-2011, 01:53 PM
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Quote:
Originally Posted by ocgamer View Post
Impressive MPG I have an 04 5.7 hemi and get 12mpg. Your diesels are impressive MPG have you ever done a comparison of cost (in my area diesel fuel costs more than gas about $.60 more) versus MPG to see which is the better deal? If your getting say 18 mpg versus my 12 mpg it would seem that the diesel is the better cost saver over the gas.
Since I own both, the comparison is easy for me. Hands-down my heavier dually is by far more cost efficient to drive than my 1500. Imagine if the cumins were in a light, more aerodynamic truck like the 2010 1500? Mid 20's in MPG? Probably. And diesel fuel in my area is about $4 a gal right now, with Reg unleaded gas running about $3.75. Not nearly enough to make a dent in the MPG difference.

All that said...I grab the 1500 keys every chance I get when my wife is not driving it. Maybe a loaded 3500 Cumins would change that, I dunno.
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RAM Truck: 2006 3500 ST Cummins:Line-X; Leveling Kit 2" with Edelbrock shocks; Ultra Custom rims w/ 265/70-17 Goodyear Silent Armor Pro Grade; Backup Camera/NAV/DVD video/Reese 24K 5th wheel hitch; RDS 51 Gal tank/toolbox; Banks:CAI, MonsterRam 3.5",Monster Exhaust;Pac Brake Prxb.
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Old 03-10-2011, 06:58 PM
Stangshcky12 Stangshcky12 is offline
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My girlfriend has a 5.9 and her dad has a 6.7. With a dpf delete he's gettin 23-24 mpg I think. He was looking for another 5.9 before he did it.
We just picked up his new excavator yesterday and its a night and day difference towing with and without the dpf (trailer GVWR 14000lbs 10k lb exacavator)
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Old 03-11-2011, 02:59 PM
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When you guys calculate mileage, be sure and do it by hand as the computer is said to be off quite a bit. You should get around 15mpg stock. My 2009 2500 got 16.5mpg city with just a cai installed.
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