In addition: No wires/rotor changed. I just don't see how new plugs can drop poor mileage ( 14 in town) to worse mileage (10). How in the world does anyone get 18/22? I bought the truck new and drove many times between Macon Ga. and Columbus Oh. and never got anything close to that.

 

I get 20-21mpg and thats not even babying it. maybe cheack your O2 sensor. when mine crapped out with no warning, I was down to 15mpg.

but I would change your cap/rotor and wires. or atleast look at them and see what kind of shape their in.

 

How do you know if it's ****ty? cuz the best mileage I've ever gotten was 12.5 MPG. Usually it's less...

 

Just wondering if you have put any thought into having you systems cleaned???? I had my fuel, transmission, cooling, and p/w steering cleaned($325) and the things runs like a spotted ape while getting 20-22 on the highway but my best in the city is only 15.... Check it out......

 

i'm getting 18 mpg highway 16 average and 12 hot rodding/muding with the old 5.2 V8 and 31x10.50 mud tires. i dont see how a 4.7 can be getting 10

 

Wanted to thank all that replied and offered suggestions. Took it to the local Chrysler Dealer. They listened to it and said it sounds like it runs fine, which it does. Asked them to put it on the analyzer and was told that they thought it a waste of money as no check eninge light was on. Can't say I ever heard a dealer turning down easy money. They reccomended an air filter change which I did and still no change. Still getting less than 11 mpg. babying it.

Thanks again.

 

I get about 12-14 in town depending on how i drive it that day, highway is the same depending on how i driv its like 16-19

 

Moe in Wichita, KS. I found that 318s and 360s, like .045 gap on plugs. dont be afrade to experament a little, just a little at a time.

 

in my 2001 4.7 CC 2wd I'm getting 15.5-17.5