I have a 1997 dodge 1500 4x4 with a 3" lift and 33x12.50 tires. I get 15 mpg on the highway traveling at 65-70 mph. I usually average around 12.5-13 with mixed driving.

Mods: Plenum fixed, full tune up, hypertech programmer, k&n, and flowmaster exhaust

 

My 98 5.9 is getting about 360 km per tank which is about 90 liters not very good. I have a hard time believing some people are getting 16/17 mpg I sure would like to get that kind of milage. That would be about 13.8 liters per 100 km so about 650km per tank. I think now i am about 10 mpg I always that was about normal.

 

I have a 99 qc 4x4 5.9l auto and after I cleaned my air filter and pcv valve today I was averaging 15.5 in town and 18.2 on the hwy according to my mpg calculator in the truck!

 

i am jealous. Do you guys drive around in o/d or do you knock it out around town.

 

Around town, my truck very seldom shifts to overdrive.......

 

I just put mine in drive and go!

 

70 mph, cruise on. I had to have my trans rebuilt at 130k. Rebuild w/ new tq conv was 1250. Was basically a rebuild to factory specs, nothing fancy...but if it lasts another 130k, thatll be good enough.

 

Here's more about and where to get the Transfer Case Saver. Here are pictures of what can happen if you trust the snap ring it replaces.

What I've done to increase fuel economy, so far: Cold air intake system, Magnaflow direct-fit catalytic converter, Gibson Swept-Side single cat-back exhaust (designed for highway/towing, not racing), DUI Screamin' Demon coil and associated parts to allow me to install and very reliably fire wide-gap (.052") spark plugs, and a Superchips tuner. On my next road trip I'm going to back down from the towing tune to the economy tune and check my mileage with that, and hopefully won't be fighting headwinds the whole way. Some have reported that they get better mileage on the towing tune than on the economy, so it'll be good to know which my truck prefers. I've not spent much time running around with the economy tune because I like the grunt that the towing tune provides -- I like the performance tune's power but my wallet stays fatter longer if I run a less aggressive tune. Once I'm moved and spending a lot of the truck's time going up and down the mountain I'm going to stick to the towing tune anyway.

In case you're curious: I want to run the wide gap plugs with a fiery spark because RSN my truck's moving to the mountains where I belong, and at higher elevations it's harder to get a really clean burn. Exposing a longer arc channel ensures that the thinner mixture lights more reliably, particularly at lower RPM where fuel atomization is poorest. Even if it's just a few percent, that setup has got to be helping my mileage a bit.

Next on the list is (ceramic coated) Doug Thorley Tri-Y headers and electric fans. Like the Gibson cat-back, the Tri-Y headers are designed for highway/towing so they help the engine to produce power in the range where it spends most of its time.

 

He has a 3/4 ton, albeit, a light duty..... so, he should have the 241 transfer case, I think?

Link to the headers please?

 

Boy, did I ever tempt fate. I wrote of the next road trip and it very unexpectedly turns out that it starts before sunrise. So the "Mileage XS" tune is in, the tank topped up, and we'll see what happens.

http://www.moesperformance.net/Produ...ode=THY-165Y-C is the ceramic coated set. Which is the only right way to go anyway.