Is it fair to say that (1) 52" 20hp lazer z is as efficient or 25% more efficient than (2) 52" 17hp w/b without velkes? W/b without velkes at 50% efficency max speed of 6.2 mph (or as fast as you want to run/walk) Lazer z at 100% efficency max speed of 8.0 mph Of course neither will be 100% efficent, but as a comparison, I can bet the lazer Z would match two of the same deck w/b. I have an aquaintance that uses (2) 52" w/b on each of his properties. If I took over using the ztr, I could do the same amount of work I think. I'm using these numbers to analyse a business purchase, so I'd like anyones ideas or suggestions. Do these numbers make sense? He doesn't use any velkes so he suffers with efficiency.