> different weights by volume, of course, how much fat by weight should a
> pound of extra, extra lean hamburger have roughly?

The rule of thumb here seems to be 5% for extra, extra lean... 5% of
16oz is: .08 oz or 22g (going on a 25g ounce). If you wanted to do 10%
or 12% (which is what our lean Scottish beef tends to be) just adjust.

That any help?

-Jen