The Husqvarna 576XP Auto Tune is the most advanced saw for demanding professional use that Husqvarna produce. It features a Husqvarna X-Torq® 73.5cc 2-stroke engine that provides high torque over a very wide rpm range, combined with low fuel consumption & low exhaust emission levels. Ergonomically enhanced handles on the 576XP AT reduce fatigue. Smart Start® provides easy starting & Air Injection makes the saw run stronger & longer. The Husqvarna Auto Tune feature always gives optimal engine setting. It compensates for different fuels, altitude, humidity, temperature & clogged air filter.