I'll consider buying a "Tune", when a strictly fuel economy tune becomes available. We all know gas will be back to $4 in no time, and I suspect a majority of Focus owners are running mostly stock engines, all of whom would appreciate better MPG, rather than more performance.
Since I haven't seen anything of the sort for the Focus..... perhaps such a "Tune" is not possible.
Oh....I'll be quite willing to test out any beta versions you might come up with. My engine is stock with a Steeda SRI. I could use a few more MPG......so could everybody else.