Cub Cadet RZT S Zero

A riding mower is by far the most efficient way to maintain a large yard, but finding a gas-free option that was powerful and highly maneuverable used to be impossible. Now the RZT S Zero pairs 4-wheel turning with a 42-inch-wide cutting deck and four 48-volt batteries that power the full-size mower at speeds of 6 mph – but with an engine hum as stealth as a large fan's. That means you can mow early in the morning without worrying about waking the neighbors. [$3,999; cubcadet.com]