The other day I ran out of gas and had to use some regular 87 octane and to my surprise it ran fine. Not a spit, sputter or ping. It didn't have as much power as 93 but none the the less it still ran great. I know I'm running 10:75:1 so what gives? I was told that it would run like crap on anything other than 93 but it does. I'm also pretty close to sea level which I thought would have made it worse. Any input?