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Garballs 12-22-2011 02:23 PM

Gas Mileage on my new 2500 is bad
I have a 2012 Ram 2500 with 5.7 Hemi, the mileage is 11 in the city and 14 on highway driving conservatively. Anyone with any tried and true methods of increasing the mileage by either changing the exhaust, chipping or adding a cold air intake. And, which of any worked the best and with what products?

erm 12-22-2011 04:18 PM

Intake and exhaust will help a little. Unfortunately, there are no programmers available for your year truck yet. CJD encrypted the PCM software and no one has, as far as I've read, cracked the code yet.

I have an AFE Stage 1 intake, a Magnaflow single in / dual out 18" muffler and a DiabloSport Predator programmer. The combination of those modifications netted me almost 4 MPH HWY and just a little above 2 MPG City.

Also, it's been reported by the truck and the LX/LY Hemi powered car communities that with some mileage on the engine, MPG improves.

But a good start for you would be an intake and exhaust. As far as intakes go, don't get a cheapie off of eBay. The inlet tubes are thin-walled cheap plastic, they crack and the filters are junk. Some have even been reported to have come apart and filter material was sucked down into the engine. Not good.

There's a thread under the Modification Sections on the 5.7L HEMI intakes that are available. Cooler air creates a better, more efficient combustion cycle. That's because cooler air contains more oxygen molecules. One of our members, who is now full-time rv'ing it but still posts here, did a great job with comparing some of the intakes available.

Good luck!

Garballs 12-22-2011 05:25 PM

Thank you Maddog for that information... will look at those sites. .. Have a Merry Christmas!

heathk2003 12-22-2011 11:33 PM

Give it a little time to break in and remember we are in winter blend gas season so mileage will suffer from that too!!

terb 12-23-2011 12:12 AM

Is it 4X4? What gear ratio do you have and what size tires are on it? Did you buy your truck from Dennis Dillon?

dixiejwo 12-23-2011 12:22 AM

I've got about 1k miles on my 2012 2500 Hemi. With 360lbs of sand in the back I'm getting about 12.1 to and from work (secondary roads, rolling hills) and 18.5 on the freeway. In my experience nothing effects your gas mileage like your right foot...except maybe too much idling.

Iamahemi 12-24-2011 02:56 PM

Your mpg is about average from what I have read on some other forums. I average about 14hwy & 12 city in my PW. I've got 4:56 gear ratio 33" tires. Isn't much difference with 4:10 gears, the 3:73 gears are gonna get you a little better mpg. I only have 1500 miles on my truck so everything is still pretty tight. I'm sure once things loosen up I might see a slight increase. All in all I think the mpg is pretty good for a truck this size.

TNhemi12 12-24-2011 06:52 PM

I just filled up my 2012 today, I got about 11.2 MPG on the last tank :(

turbojoes 02-08-2012 09:43 PM

I have an 07 mega cab with the hemi, 3.73 gear, 315's and i get 9-10 in city and 13 on the highway.

t00tall10169 02-08-2012 10:08 PM

at least im not the only guy with the same mpg numbers. i thought i was the problem but i guess these are the #s. good thing gas is cheap... not

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