That is pretty low. I get better than you are getting WHILE towing 7,000 lbs!

 

Have you cleaned the throttle body, IAC solenoid, and adjusted the TPS to approx. .75. yet?

 

Full tune up will help. Search for it under my name.

Are you running the 3.50 gears

 

What gear ratio do you have on your D? I assume this is a 4x4 since you installed 33's? I know if your gear ratio is too low and you have big tires, you can overwork your 5.9 and get crappy gas mileage.

 

Last bit of work I did was to change the spark plugs. The gears are factory, have not changed them since going to 33s.
I'm not knoledgable about cars, of all the cars that I've had, the Durango has been the first one I've ever gotten my hands dirty with. Since I don't really need it, it's the third car in the house, if I mess up working on it I can still get to work the next day.
As far as touning and stuff, I'm still an idiot so I'm not sure of what you are all referring too.

I'll read the threads you've recomended and see if I can do better with my gas milage. If any of you can expand with your ideas and give me simple stuff that will help, it would be great.
I really appreciate all your help, these forums are a great sourse of info.
Thanks.

 

ok the simplest idea is to coast as much as possible and keep it under 2k rpms, and drive w/ od off (or tow haul on) under 40 mph (keeps the transmission from shifting as much and keeps the revs down) and keep it properly maintained easiest things to do


and btw i would like to know what kind of mileage you are getting now i dont recall seeing it but i may have missed it


edit: nvmd if you do these things you sould be able to get about 16 on the highway w/ that engine and around 13 or 14 in town just try what i said and make sure that everything is done

and check the plenum gasket open the butterfly on the throttle body and look to see if there is an excessive amount of oil in there you may need to replace the gasket on it

just some more stuff i thought of

 

taking off the Throttle body is easy it's just 7 bolts Alot easier than it looks. check out the DIY section

 

DOR318,
What's the TPS?

 

Throttle position sensor.

Get under the truck and look at the bolts on the rear axel diff (large pumpkin looking thing in the middle of the axel) on the back side. (Towards the tailgate) Located on one of the bolts (usually left top bolt) there should be a small brass tag. If you clean it off you can read 2 numbers on it.

3.9 or 3.5 and this will tell you the gearing ratio. 3.92 OR 3.50

3.50:1 Will give ya that mileage.

 

A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the throttle valve butterfly.

The sensor is usually a potentiometer, and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position).

The sensor signal is used by the engine control unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).
Check out the DIY section http://www.v8performance.com/tipsandtricks.htm#TPS_Mod
Dude If you take off and clean your throttle body and IAC selonoid , then set the TPS you will notice a increase in power, engine smoothness, and may be MPG's