Ive been using 93 octane since I bought my Superchip

 

Try 93. Or 101 if you can find it. There is a few stations around here that sell it for all the high end sports cars around here.

 

It sucks you loose like 20 hp per 1,000 ft. Something like that.

 

I can vouch for that! I got my truck while I was in the AF, stationed in Utah. I was at about 4800 ft there, and now I am out and back in middle TN at about 5 or 600 ft. The drop in elevation made mine run much stronger!

 

Yep there less air higher up that why air plans have purized cabins. If they didn't we would have to breath bottled o2.

 

Yeah, it sucked for sure! Glad to come back down here in the high HP range.

 

LOL I'm sure.

 

i usually use mid grade with ethanol
(its whats in the farm tanks)
or the el cheapo stuff at gas staions

 

Yeah high altitude does suck. Living at 5280 takes a big hit on the horse power. As for gas price I don't think it's any cheaper than at sea level.

 

Ya, I live at almost 7000, and I can tell a big difference in power when I drive to places only a few thousand feet lower. I've also had the truck up over 12k on numerous occasions, and even up to 14k once or twice, and it becomes very noticable. But our PCM's for the most part compensate, just not very quickly. That's why I have the air/fuel controller, high altitude is the only time I ever use it.

Sort of. There is just as much air, i.e. oxygen, at high altitude as there is at sea level. The difference is, the air pressure at high altitude is less.