yes you can operate it in any position. you can rev it all the way all day if you want to but it's not necessary. it cuts as good at 1/2 throtte as a 2stroke at full throttle. a tank will last longer than you will. you will take a break before the tank goes empty. i figure it will last at least 1 1/2 - 2hrs or more on a tank. that's using it hard not just idling. it doesn't use a drop of oil between oil changes. it never has.