The power of the combine affects its efficiency.

The width of the combine harvester's cutterbar, typically available in 2-row, 4-row, 8-row configurations, also impacts the efficiency of the harvester.

3. The method of harvesting, such as whether it is to harvest corn cobs or corn grains, will also affect the efficiency of the harvester.

4. The proficiency of the driver, the condition of the vehicle itself, and other factors can also affect the efficiency of the combine harvester.

5. The shape and distribution of the fields to be harvested also affect the efficiency of the combine. Generally, regular plots are faster to harvest than irregular ones, and contiguous fields are quicker to harvest than scattered ones.