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Knocking is detonation caused by fuel that burns to quickly for the engine. High compression engines need slower burn for their pistons extra travel. Knocking can damage engines, modern knock sensors adjust the timing so this does not occur. I only use premium in my small engines, no ethanol to eat fuel lines.

It looks like a solid choice for what you have in mind. Unfortunately I can't give any feedback on the newer models, since mine is an 05 diesel. Other than replacing the battery several years ago, it's never given a single hiccup. I would however, highly recommend the diesel motor. Mine is a beast, it has out pulled my 4wd New Holland 27 hp. tractor! Of course that was an isolated incident, and I'd be very surprised if it did it again. But I've never had any power, or traction issues, and my use is around the farm also. It's a tough, reliable little machine. Mine has a lift kit, and side bed rails, as well as a couple other things, to make it more useful. The availability of aftermarket add ons like these were the main reason why I chose the mule over something like the Kubota. If the Polaris Ranger hadn't had automatic engagement on their 4wd, I might've went that way. I just don't like equipment that does my thinking for me. But the bottom line is; get something that has a good dealer support in your area. Good aftermarket parts availability, so you can tailor it to your needs. There's lots of buggies out there for joy riding, and they're great for that purpose. They've got the independent suspension, high lift, and powerful motors. But you'd probably be happier with a clunky old school straight axle machine. Those things are purpose built for work.