Ok, I have been getting at the most 12 mpg and at the least like 9... Last night I was driving home from my old High School's graduation and decided to check the odometer and trip. with the mile markers. I WAS RIGHT! My odo/trip is off a little more than .10 of a mile ever mile consistently...

Is there any way of figuring out how to calibrate it and/or figure out what my true mileage is?

 

do you have larger tires?

 

no their 235/75/15's??? Thats the stock size right?

 

my speedo is 11% off, when the speedo shows 60, im really doing 66...bigger tires...annoying...but several hundred dollars to fix it... so i live with it...

 

My speed is dead on. But my miles aren't.

 

u could always get a superchips tuner lol
then u would have a good tuner AND be able to adjust ur speedo to ur tires

 

what part of several (4) hundred dollars didnt you get? lol im saving up for one

 

lol yeah I want one too. But would you be able to change the odo/trip with it? I'm kinda bummed because I have been trying to figure out why my mileage is SO BAD! And with my truck reading a mile at 1.1 to 1.2 miles... Thats a pretty sizable amount of fuel over the long run.

 

You can pick up a 3715 for under $200 on Ebay and can find them even cheaper on Craigslist if you hunt around. This is how I got mine. I put a performance tune on mine, adjusted the speedo and actually felt like I gained a little power with 1-2mpg increase. Of course my mpg increase went out the window because I like to get into it now (love the sounds of my exhaust lol). Speedo is right on with GPS and I use mid-grade even though Superchips says premium, haven't had a problem yet and its been almost 2 years.