Any advice on tuning an F150? specifically a 2003 4.6 supercrew

Don't have a lot of modifications or anything like that, but I am trying to squeeze every MPG possible out of it.

Are there any programmers that will let you manually adjust the fuel maps, or are they all just canned?

Thoughts on just using a SAFC-II and a wideband o2 sensor?

I know neither of those options are the "best" and a custom tune on a dyno would be ideal.
But A) I don't know anyone that tunes fords and B) not sure if the money is worth it since I'm not tuning for big mods or anything like that. Just trying to get as much MPG as possible out of it.