I looked up all of new Gleaner models on gleanercombines.com and I used the AGCO Compare to see the difference between each model, and there wasn't a single difference between the three models except for the engine. This was the only difference that I could find. So, I was wondering what in what situations would you want to get the S68 or the S78 or the S88? I am just trying to figure out what size of combine would be good for our operation. We currently run a Gleaner R62, but it really doesn't have enough power to climb some of the hills that we have. It is a good machine but we are looking to upgrade. We run on some pretty steep hills, and we would be cutting between 5,000-10,000 acres depending on what happens with us this year.