Hello all I am Ryan and I am new here. I been looking at this site for a while for references and well I finally joined. Last yea i drove to Hilton head which was a 700 mile on way trip. Going down and back I did not have any issues. The next day after I came back I was going down the highway and herd a rattle. I crawled underneath and notice my cat on my passenger side a broken inside. I was quoted 1800 for OEM replacement so I did it myself. I got two new cats,one for each side and put them in and welded new bungs in. At the time i figured I would go ahead and put two new O2's in as well. After about 1k miles i started to notice a similar notice again. I went into the hood to notice my plugs loose. After i tightened them with my hands i went back to the house to check it out. I replaced all plugs and re torqued them. Since then my mpg has been roughly 9 with city and HW miles. Probably 10-15 HW miles a day with city only being about 1-2 miles day. On a full tank of gas (I believe 28gal) I am on E about 230 on trip. This seems really low for my truck and was wondering if something else is wrong. I need new tires and am getting some next month before inspection. The truck is Can tuned with a SCT Tuner, Gotts Mod, K+N Air filter, new fuel filter, New trans fluid + filter, two new cats, o2s and plugs as i mentioned above. It has a 2.5" HBS LVL kit in the front and that's it. I drive with a soft cover in the back. It currently has 120k miles. I hope this is enough info for you guys to help me out. Been sitting on this one for a while and finally had to ask LOL

 

Sorry for souble post but my crappy phone aint working right. Cel light is not on but P0316 Misfire Detected On Startup (First 1000 Revolutions)* is in the history. Future thanks to all who help.

 

Check your tire pressure lately? My mpg goes to hell when I let mine get low.