am i just imagining a difference, switched from 91oct. to 93 oct.?
 

i live at altitude, 6500', and it is rare to find a station with 93. i've been running 91 since i got my '01 1.8t quattro. am i feeling a difference due to the last couple of tanks of 93, or is it my imagination? i'm not chipped.

Believe it Boki!
 

I have been using 93 with my X-chip for a month, it's much better, yesterday I had to get a few gallons of 91 to tide me over, I definitely noticed power loss with the 91 compared to the 93.

hey now, J!

So you're really back this time, eh?

Boki, where in CO did you find 93??

Look Here
 

<ul><li><a href="https://forums.audiworld.com/rockymtn/msgs/609.phtml">High octane in CO</a></li></ul>

Ah, tank u tank u!

I live in Lubbock, Tx(only 91 cotane)
 

When I mixed 5 gallons of 100 octane with half a tank of 91, my car was much faster by my butt dyno.