Just replaced my R50 with a 1688. Fuel consumption is at least double on the CIH. (390 litres to do 48 acres of corn). Allis would have done 100. Have done very little wheat with the 1688 but it doesn't seem to have the advantage I imagined. Capacity in soybeans and corn is good but the R50 was not far behind. I'm looking for greater economy at the parts counter. Obviously some of that is going to the fuel company. Parts availability appears better at CIH. Dealers are certainly more common. It is sure nicer to load a grain buggy with the CIH