I was doing 20 MPG after a 7 hour highway drive with poorly inflated tires (30ish PSI each) so I can only assume that at 36 PSI each I must be gaining at least 2 MPG. I was just guessing though.

And that was holding the cruise control right at 98-100ish km/h. People behind me sure didn't like it, but meh. It's the speed limit anyways.

 

02 Ram, 5.9 4x4. On my way to Ri, with the cruz set at 70 and drafting an 18 wheeler, 17.5mpg, With out drafting an 18 wheeler I got it to 17mpgs. Around town, it goes any where from 10-13 mpgs. I drive it like a little old woman haha. Till, I get stuck behind one.. haha

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Isn't that the truth.

 

haha.

 

08 1500 4X4 with Hemi = last two tanks of gas were calculated at 9.32 mpg and 8.31 mpg.

 

Running rough?

 

I have a 2007 Dodge Ram 2500 LARIMIE 4x4 MegaCab 6.7 Diesel running 100 % stock everything EXCEPT tires and wheels. I removed the stock 17 inch tires and installed 37x13.50R22LT so with My BIG tires mounted on 22 inch rims I Filled Up and drove 127 miles...I filled up again after driving 127 miles and it took 9.42 gallons....so 9 1/2 gallons used for 127 miles Im getting around 13 MPG????Guess I need to change My EXHAUST and Get Me a H&S programmer Soon
SEMPER-Fi

 

How did You get that to come up???? I just Bought My truck 2 months ago and it did NOT come with a manual????? I have one of those things overhead But ALL Mine says is SERVICE?????

 

I would take yours into a shop the Devil, and have them check it out..

 

H&S all the way! Let that truck breathe with an exhaust!