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I have a 2000 Excursion and my mileage was around 12.5 on the hiway which was nothing to write home about so I did a little research also, now I get 16 on the hiway. Here is what I found and none of it will effect your warrenty. I bought and installed a fuel body spacer which can be found at Summit Racing for around $45 and a K&N air filter which was also around $45. As I was installing everything I looked at where the air intake got it's air from. Now this was where I believe I got most of my mileage, the air intake stops right in front of the plastic support at the side of the rediator. I pulled the front grill off which just pops on and cut a square hole into the plastic right in front of the air intake. Now I get great mileage in respect to a V10 and I have noticably more power. What I found doing my little research was that the more cold air you can get into and engine and the larger the pipes to get the exhaust out of the engine the better power and mileage you will get.
Good luck.
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