What is the fuel capacity difference between the John Deere 6R 165 and 6M 180?

The John Deere 6R 165 has a fuel capacity of 74 gal. and the John Deere 6M 180 has a fuel capacity of 85.9 gal., a difference of 11.9 gal. The John Deere 6M 180 has the higher fuel capacity.