I don't expect a 2nd gen truck to get 20mpg never did never will. If you can't afford to drive/feed it sell it and go by a little car.

 

fixed it for you

 

^^^ Thanks I missed that.

 

Let it coast down a big hill in neutral.. only way you will get 20+ mpg in.these old pigs

 

i think fix the plenum, replace o2 sensor, cat and install a standard transmission ,dual electric fans and possibly some narrower low rolling resistance tire on my ram charger and i could get 20mpg on summer gas. i have seen 18mpg as it is.

 

Hey, i have gotten 20MPG on this 5.9L after a fresh tune up. Not too bad but that is without a lot of getting into it.

 

all I have to say on this subject is look up smokey's hot vapor engine.

 

Done and WOW...very cool.

 

Been driving 140 miles everyday this week, and from what I've been calculating I'm getting approximately 13 MPG. Thats about 90% highway 10% in-town driving. Consistent 70 MPH. Thats with 285/75R16's, 3.55 gears, stock timing chain, stock O2 sensor, possible bad plenum, out of alignment, and winter gas. Damn, imagine the possibilities after I get these other things fixed lol.

 

the Hughes plenum was put in now just running this tank of gas down to see if the mpg improves


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