What is the fuel capacity difference between the John Deere 6R 130 and 6M 130?

The John Deere 6R 130 has a fuel capacity of 52.6 gal. and the John Deere 6M 130 has a fuel capacity of 54.2 gal., a difference of 1.6 gal. The John Deere 6M 130 has the higher fuel capacity.