We've only done this 3 years, all on buckets. '06: 180 taps, 0.35 gal/tap; '07: 200 taps, 0.31 gal/ tap; '09: 230 taps, 0.38 gal/tap. No more than 2 taps per tree regardless of size and most had one. We do tap young fast growers down to 8" and had several of those.