I agree with Empty Cruise.
Since the C152 has been mentioned, I'd like to point out that, in practice from the pilot's perspective in this aircraft, there is no discernable difference between Vx F0 and F10 - same for Vy for that matter. If the difference in gradient between the two is so minor as to practically immeasurable, Cessna would not bother to specify F0 and F10 procedures. A matter of theory versus pragmatism, and pragmatism winning.
Cheers,
O8