To the OP....this is not a dumb question as many are suggesting, but also not the most important statistic when purchasing a combine. Also, the following is not mocking you but instead pointing out some of the (unrealistic and different) expectations we all have.

The next combine I purchase needs to meet the following requirements......Most HP available with highest per hour throughput. It also needs to be the least expensive machine with the longest warranty available in the industry AND also have the highest trade-in/resale value when I want to get rid of it sometime within the the next 25 years.  It should also have all parts available for the next 25 years along with a tech available to work on it in the event it breaks down.  Also, those parts should be available at Napa, Autozone, O'Reilly's, Carquest, etc.  It should have zero technology on it so it can't break and should also be the most fuel efficient.