I got a chance to run a T670 last night. We were in standing Domain spring wheat. It was yielding 55 to 65 bpa. There was 2 9750s and a 9860 also in the field, both non-bullets. We all had 30 ft auger headers. When the sun was still up the 9860 was right beside me, 3.5 to 4 mph. Our sample and losses very similar. Moisture was 11 to 12%. 9750s were doing 3.2 to 3.6 mph. Different story when it got dark. Moisture jumped to 14% and 9750s slowed down to 2.2 mph. 9860 was down to 2.5. I was still doing 3.2 to 3.6 mph. Power was the limiting factor. I believe with 400 to 425 hp this combine would be an incredible machine, especially in tough heavy straw conditions. Deere is really onto something.