I run a Kohler 28 efi on a 66" deck and a 35 Kawasaki on a 72" deck. Normal cutting conditions there will be no difference in mowing my dry southern grass other than the 72" has a faster ground speed. There is no engine manufactured that will crank and run better than a closed loop Kohler efi engine. I hate a choke after running an efi engine for going on 8 yrs., the engine will crank in two revolutions no matter if the temperature is 30° or 100°, whereas I must play with the choke to get the 35 smoothed out, and it is more cold natured. I cranked the Kohler efi one morning a few days back when it was 16°, it started turning slowly but once the engine revolved a couple times it started right up. Go attempt that with a carbureted Kawasaki and see how long it takes to get it running smoothly, whereas the efi was running perfectly in 5 seconds, believe me, this will spoil you, as will the fuel economy. Had I been able to get the big block fuel injected Kohler on my Super Z, I would not have considered a carbureted, or open loop fuel injected Kawasaki, would not have crossed my mind as to which I would purchase. The 35 will hold the rpms up; and in really no matter the conditions, but you will pay the fuel bill. I will say if you are in normal cutting conditions, no overgrowth or dampness, the Kohler will suit your needs pretty well, but if you are like me and hate to ever fall short on power for any reason, the 35 will suit you better. The real engine to own will be a closed loop fuel injected big block Vanguard, of which I am told should be ready by fall of this year.