that that's freaking me out then, because i know one is out, but idk which one..

 

Actually I have an 89 dakota with a 3.9 with 240000 original miles and it averages 22 mpg without my topper on it and around 18 with the topper.
Love this truck, it's on a 13 hour road trip now in temps under 18 degrees and doin great!