I just bought my new-to-me '04 SE a few weeks ago. Previous owner replaced failed exhaust manifolds with headers to a Borla muffler and then out the back, no "cats". So it's been programmed with Uprev. It's also got some brand of cold air intake. 6" Fabtech lift on 35s. I'm only getting 8 mpg. I'm excited to have a Titan, I've wanted one for a while, but I don't love this shame-full mileage. Where should I start? Is this just what I get with this set-up? Also my "Slip" light is constantly on, the "Service Engine Soon" light has come on a couple of times but goes out on it's own. It's got 156,363 miles on it. Any help/ input would be appreciated. I reached out to the folks at UpRev to see if maybe the previous owner had it flashed for drag racing, and maybe there is a mellower set-up. UpRev didn't seem to feel that they should be where I start my process.
