ok I just got it. So, 8%. Thats pretty big. Let my try to do some mathe here. lol

 

So after the math, I am getting 11.0 all City, on a half tank of gas.

 

My stock tire size was 245/75/16 and if he is 4x4 his stock tire size could be 265/75/16,

How did you fix the plenum, I see nothing wrong with the temperature, if it was 120 it would be different

How fast do you drive and is it all city, do you leave overdrive on, I keep a log of my mileage every time I fill up and how many gallons it takes, then write in any repairs.

I noticed your 16 what rpms is the truck shifting at during your grandma driving

 

I'm not sure if 2wd rams came with 245's from the factory or not.

The sticker in the inside of your drivers door should say 225.

My sticker says 245 and the build sheet says 265.

A good question would be if Dodge calibrated the speedo's according to the specific truck ( 225 245 or 265)

 

His truck is 2wd, just look at the stance in his sig pic.

 

I try to never get it over 2500 RPM. I always leave overdrive on. Should I turn it off? Its not a 4x4. How did I fix the plenum? Took it out and repaired it. My DD to school is a few miles of 50 mph, then 45 for 1 mile, then 35-40 the rest of the way to school.

I have the K&N circular filter, flowmaster exhaust. Tune will be next. I took out the first 02 sensor and burned off some crap with a propane torch, runs great, idles at 650. The reason my uncle sold it was because of the terrible MPG. He got a GMC Sierra.

 

Sounds about right, well maybe a little low for a 2wd.

 

Well I know my speedometer is dead on with my gps and mine has had 245/75/16 tires on it since the day it came off the truck

If you havent put a treatment of seafoam through it since you owned it, I would say do that and get ready for the smoke

 

Just replaced the plugs with the autolight coppers, and tomorrow ill get a new dist. cap and rotor. Other than that, I dont know what to do. Take the hood and backseat out for weight reduction? lol

 

Maybe a superchips to cure the death flash. (if you have it)

Last winter I had a dakota club cab 4x4 3.9 and I only averaged 13 mpg in the winter.