So I'm kind of getting bored with my stock 04 non heritage fiddy. I'm seriously thinking about a Diesel Super Duty. However, if I could do a few things to my truck to help me like it a little better I might keep it. Mainly the thing is that even with diesel price being 30 cents more than gas, I can still drive one for cheaper than my fiddy cause I get 14 mpg TOPS, usually 13-13.5. So if I could kick the mpgs up to about 16-17 I'd be happier with keeping it. I'm thinking about an intake, exhaust System, and probably a tuner. With all o those, or a combination of them, is it really possible to get 3 mpg better mileage? I also may put a leveling kit on, and I know that will knock it back down a tiny bit probably. Thoughts people?!?