What is the fuel capacity difference between the John Deere 6R 145 and 6M 150?

The John Deere 6R 145 has a fuel capacity of 74 gal. and the John Deere 6M 150 has a fuel capacity of 54.2 gal., a difference of 19.8 gal. The John Deere 6R 145 has the higher fuel capacity.