I recently purchased a 03 Excursion 7.3, 4x4, 4" lift, 35" tires. It was set up for search and rescue so between the front bumper and winch plus the roof rack set up my millage blows. I drove it back from TN to VA and averaged 12 per gal, it has an ATS 2000 propane system but after reading all the poop about them I'm not sure if I want to use it. It also came with an old edge tuner 2004 ? I'm using the tow mode now and it seems to have helped some. Truck only has 80k on it and runs out well but could use some HP help for sure, I'll be ordering a DP tuner any recommendations would be great. I don't want to come off like I'm crying about the mileage I love the truck and will live with it, I just want to be smart about any improvements I make.