Drew, what are your mpgs right now?

 

the display in the truck shows an average of 12

 

you cant trust the built in mpg thing you need to do it by hand to get an accurate number, fill tank and reset trip meter, drive until its low, fill it up and divide miles driven by gallons put in the second time.

 

yeah I never checked it myself with the trip......never filled it up yet but I know its gotta be close maybe off by a mile or so. I guess next payday i will fill it up. prob have to grab my a** after i see how much it is to fill up. I do have 33" tires on it. so those cant help the mileage.

 

You stated that you have a 5.9L, but what else? Is it AWD, 4WD, or 2WD?

I have 5.9l, AWD, 3.92 differential and I average about 13.5 mpg with mostly city driving (with a light foot). My mileage was down to ~12mpg 6 months ago until I did a ton of maintenance like replacing the ignition coil, plugs, wires, cap/rotor, cleaning injectors, etc. Maintenance and quality parts are the key. If you have the 5.9/AWD setup, I seriously doubt you could ever avg above 15mpg city.

 

idk my gearing but it has 4wd I keep it in 2wd. also when i bought it the guy already had the front drive shaft out. does this really help at all with the mileage? And idk when the last tune up was either.

 

not the case, the overhead is known as the lie-o-meter for a reason, it can be off by as much as 5 mpg in either direction, i have seen mine read 23 after a full tank of gas has been run thru it (i reset it every time i get gas,and the best mileage i have EVER gotten out of my truck has been 20.x all highway)


and no removing the driveshaft does NOTHING for mpgs, IMO its a waste of effort bc it cripples the 4wd system

 

If you take your foot off the gas and push it down hill you MIGHT see a 5 MPG improvement.......LOL

 

lol yea.....ill just have to save for a superchip.

 

You are half correct shrp. I gained nothing city driving. My gain came from highway driving. At 55 mph the computer in my truck use to read 16 mpg. After insallation it reads 21 mpg. It has been 2 years now. So if anyone is lying it would be my truck, not me.