Ok guys. I gotta hum-dinger. This was a month or two ago. I am doing a leaf job and my blowers both quit on me. I take em' to my dealer and a guy I know who does lawncare asks if I need a blower today. I say yes and he loans me one of his C4 8510s. I use it and am impressed with it. Latter I get a call from my dealer saying that both blowers are shot. He asks who put gas in them. "I did" I say. Well...... Straight gas does work well with 2 cycle equiptment....I made this mistake because I had 2 identical 5 gal. tanks in the back of my truck. I don't rember if it was right then or a little while later that I realized that I had run 2 TANKS OF STRAIGHT GAS IN THE BORROWED C4 BLOWER. I told my dealer about it and he says it has been permenatly damaged. So I had to buy that guy a brand new 8510. But here is the interesting thing, The 8510 that I ran two tanks of straight gas in, still runs. I am going to run it untill it dies. It is kinda hard to start though. The moral of this story is, MARK YOUR GAS CANS! and NEVER BORROW EQUIPTMENT! My 2 cycle can has been spray painted orange. There can be no mistakes now. $540 I'll never see again.