What is the fuel capacity difference between the John Deere 6R 140 and 6M 145?

The John Deere 6R 140 has a fuel capacity of 52.6 gal. and the John Deere 6M 145 has a fuel capacity of 75.3 gal., a difference of 22.7 gal. The John Deere 6M 145 has the higher fuel capacity.