I have a 2001 Dodge Ram 1500 4x4 Off-Road, I purchased the truck nearly a year ago, and averaged almost 14 mpg, it was basically stock except for it did have Flowmasters, I have since put on 33" Mickey Thompson MTZ's, a Hypertech programmer, and a K&N Filter; my current mpg is just under 8, it has just gone over 100k for miles, and has had a tune up (plugs, wires, and rotor). What can I do to increase my fuel economy back into the double digits, it is a 5.9l, and I believe it may have 4.10 gears, but I'm not certain of that, all fluids have also been changed regularly. I'm getting to the point where I'm ready to buy a diesel just to increase fuel economy

 

Get rid of the 33's and the Hypertech programming. With those kinds of mods you're hard pressed to get 11.

 

I get 12-13 usually with 33's and 3.92's.

I dunno, once I did a bunch of crap hoping for better milage and I got 17.75mpg the road trip after that, I was really happy.

I gave it a tune up, ran 1/2 qt of marvel mystery oil in the oil, the other 1/2 through the gas tank. I also put some higher concenterated injector cleaner then was recomended through it (not at the same time at the marvel) and I new air filter I think.

 

I'm getting between 11-12mpg consistantly with my Off-Road. Granted I have smaller tires (265/75-17's) but with your 4.10 gears, the 33 inch tires shouldn't hurt your economy too much.

I think the Hypertech is killing your mpg. I had one on a previous truck (Ford) and the mileage went way down and the power increase was only minimal.

 

I agree...loose the hypertech

 

Well the original tire size on a 2001 off-road is a 275/70/17, which roughly equates to a 33" tire anyway, so that's definitely not the problem.

 

well my boy...i will tell u what the problem is....its a dodge and they get ****ty gas mileage but i wouldnt trade mine in for anything!!!!...you will have to buy a smaller truck or an escort for mileage...lol...cause you picked the wrong one if thats all your concerned with is mileage, but sounds like you programmer is making it worse!!!!!

 

I agree dodge mpg sucks, but my V10 gets 10-11mpg and he's only getting 8. I still say get rid of the programmer to start. If that doesn't work, tear into it and clean every fuel/air system component possible. Replace if bad.

 

its not the hypertech nor the tires. i have both, and with 3.55 gears get about 13 city and 15 hwy.
check for bad 02, clogged cat, etc.

 

make sure that the parking brake cables are hangin up on ya and keeping the rear shoes dragging. happened to my mother and she couldnt get 200 miles outta a tank on the highway(explorer) changed the cables out and greases the pivots and she gets near 350 on the highway now. 18 gallon tank