31,000 miles in 12 years? That truck has been sitting a lot. Low miles always sounds good, but in reality it really is NOT good for the parts that count on the circulation of fluids to keep them clean and/or pliable.

Have you tried hooking it up to a reader that can extract more than just generic codes?

*EDIT* It IS a sharp looking truck...

 

the trucks check engine light isn't on. would it still show error codes, thanks for complements.

 

I'd say it's in need of a tune up. My old '04 Hemi 4x4 averaged just shy of 13 mpg in all around use with 4" of lift, a ton of power mods and with winch, full boxed sub frame and gear topped the landfill scale at just shy of 7000 lbs. Still could manage 16 mpg on trips if I wasn't towing. That's about what my '02 Chevy 5.3 did stock WITH 100 LESS HP.

But I was meticulous about upkeep and used all synthetic fluids...

 

I had read about the "ground the TB" mod sticky. Some say it helps with mpg and others say no difference. Those that have benefits tend to use a thicker gauge wire.

The benefit is better pedal response, thus better ability to control your foot when getting into it.

I do find that keeping the pedal pressed to show RPMs around 1500 tends to be a sweet spot, but it depends on road conditions and location.

Our Rams also have different rear axle types. The 3.73 is a little better than the gen-2 having the 3.92. My problem is, I went from a 5.2L to the 5.7L HEMI. Thus, the rear axle benefit for comparison is abut the same for mpg.

 

My overhead is about 1mpg optimistic, most of the time. I don't have a hemi, but I'm doing good to get over 11mpg city. Doesn't matter what I do. I never got the EPA's rated 17mpg highway (unless I drafted someone) until I started working on the truck's aerodynamics. My truck's OEM sticker said 14 city, 19 highway! HA!

@smicksjohn, you may need to take that truck down a country road, drop the hammer...and blow out some cobwebs. Weedahoe gave you a good list. Sharp truck, by the way.

I'd be surprised if the TB ground wire helped mpg; throttle response sure. My wife's Avenger has one. Off idle response is noticeably better.

 

I have a 2007 Ram Mega Cab 1500. Stock everything except K&N Air Filter, just turned 120,000 miles and I'm averaging literally about 7 MPG in the city, which really confuses me because I have a very light foot. I'd love some help figuring out why mine is so damn low when I'm reading all you guys are averaging between 12 and 14 in the city.

 

If the bottom end blows up do i need a new intake manifold. Im seeing alot of videos showing valve seats in manifold but if mine doesent have that problem can i clean dust and debris out of it and reuse it on my reman engine