I am wondering what you get miles wise on a full tank of gas? I have a 2001 4wd and i get something over 300 miles a tank. Last yr i put spark plugs in and cleaned (tried to) the air flow sensor area. I need a new air filter i am sure, clean the sensor again and run some seafoam in gas. I want to use it in the vac lines but makes me nervous. How much does the fuel injectors being clean help? Having a shop clean them how ever they do that. Sometimes i drive it hard to "clean the carbon out" does that help? Anything else thanks

 

I get about 480 on a tank (roughly 22 gallons).

Though I have the jeep TCM mod.
01 durango SLT Plus AWD 4.7 with 3.55 rear

 

Cant comment on the 4.7. All I know is there are not really any miracles for mileage. I dont know anything about the jeep mod. Keep it maintained well and drive smart.

 

FYI in the city I get about 250 @ 18 gallons

 

480?!?! I"m gonna have to check into that jeep mod, if it helps that much.

I'm getting anywhere between 295-350 miles, depending on how many highway miles I drive. I averaged 323 during 2012.

 

My 480 is pure highway. I don't do combined as my Durango is a 2nd spare vehicle and hardly sees use.

 

I get 370 - 400 highway at about 20 gallons. This is on the 2002 4.7 2wd. 70 mm throttle body and k&n intake

 

'02 4.7 4wd
Just over 20 highway.
About 14 highway towing 3500 Lb. boat.
Only 11-12 in town.

 

I want to do this also. Will any one from a GC with a 4.7 work or does it have to be a certain one? Where is it at on the jeep thanks

 

google jeep tcm mod as I forget the details. Something like it needs to say 1905A at the end.. I think mine was from an 05 Jeep GC.

FYI I can’t remember if these numbers were with the mechanical fan or just running only the OEM electric fan.