I bought my truck in December and I was getting around 15.5 highway. I just finished with two new addons, edge juice w/attitude and 4" turbo back, muffler delete, into a 5" tip. On the 1st setting which is +40hp running 58mph for 45 miles I got 17.5. After I filled up I went a different route, 58mph for 15 miles and 68mph for 30 miles and I got 19.6, this was done on the 2nd setting of +60hp. Also I probably should mention I added 8oz of lucas fuel treatment to the first tank, before I even started on either run. Are there any other things I can do, besides intake, which is next on my list, to get the mpg up over 20? Also this is an auto truck, not manual. Thanks in advance.