Autumnal leaf colour change in sugar maple (Acer saccharum) Credit. Credit: Christophe Rouleau-Desrochers. Usage Restrictions. Credit must be given to the creator. License. CC BY.

Red maple (acer rubrum) and silver maple have sap sugar content usually between 1.5% to 2%. This means it takes more gallons of sap, more fuel and a longer time frame to boil this down to a gallon ...