Don't know how fast you want to mow but cc manual on 1046 says top speed 5 mph, that seems pretty fast to me to do a good mowing job. speed wise maybe someone can figure out a way to hook up a speedometer to these or if you really like math figure out how many seconds it takes you to go 100 ft and convert to mph. sounds like to much of a math problem to me. There are 2 new 1042/1046's in my neighborhood this year besides mine and they are not having any problems, one appeares to run his flat out when mowing. The three blade does a better mowing job than my old 2 blade. I don't mow as fast as the neighbor and it looks better. I pulled an Agri-Fab areator/seeder combo unit with no problem with 50# fertilizer. It often appeares that people aren't reading the manual by some of the comments posted. Thats the first place to start. I have mowed 1 1/2 acres twice with a short slight >15 degree inclne in places with no problem. I would also encorage buying from a dealer rather than box store ie for service, parts,etc and they know more about what they sell.