sap quantity

[old tom]

I just was curious,what is the average, and the most sap you can get from 1 maple tree per season. I read somewhere that 20-25 gals per year was the most. What is the most taps you have put on a large and old tree.
Thank you.:

[sugarman3]

About 20 gallons is a good estimate ,and as far as tapping an old tree,until I can't reach around the tree,one tap and then I never put more than two,old trees are just that,old and 2 taps are good,and just like us we don't heal as fast,they don't either,you will get just so much sap.

[Ivyacres]

I thought the rule of thumb was 1 quart of syrup. That would be closer to 10 gals of sap. I don't know.

[Michael Greer]

I got 1/3 gallon of syrup per tap last year.

[Sugarmaker]

10 gallons on gravity, 20 gallons on vacuum.
I have put 4 (5/16) taps in the big maples.
Regards,
Chris