I'm guessing 5'8" is about right...I stood next to him and that's how He looked to me...He looks shorter on T.V., but in person He surprises you...5'8" got to be close...
He and I spoke during breakfast at the Derby some years ago and when we both got up to leave we were about eye level with me just slightly taller...so 5'8" would be correct.
. . . and it's hard to judge a guy's height by the usual process of photos of the guy seen holding his cue perpendicular to the floor (with cue butt touching the carpet) because Efren's cues are generally and purposefully 60 plus inches long.