I'm confused. When you say all legs are in F, do you mean First? In your original post above, you first say coach and then you say F. An all First class award would be 45K mininum.
I can get a coach ticket out of Fort Wayne, IN for 32.5K (didn't provide itinerary) OR a First class ticket on all legs out of DTW (approx. 2.5 hour away-no big deal for me) for 45K miles.
Hopefully that clears up any confusion.