Fold to river bet optimal value at 2/4-5/10

[MrEngenic]

I know about the "I hate you tiger woods" but it's been
awhile since it was posted.

stats post

I have a coach who plays 30/60-100/200 on party and his fold to river bet is 25 %. He says mine is waaay to high, 45 %. I know it's a little high, but 2/4 plays differently.

What are good ranges for fold to river bet on the small stakes games? Please comment, or just say what your FRB is.