Premium pump gas comparison?
 

I notice quite large differences between different brands of 93/91 octane gas. I know that there is a comparison as to which brand has the best Knock resistance, and which one makes the most power somewhere on the net, but I cant seem to find it.

Myself, I am a fan of shell gas lately, as I have been able to run it extra lean with great results.

askin a question or making a statement?

shell stations in my area all changed to jacksons and the prices nearly doubled. If they actually have better gas id like to see a test to prove it. Otherwise ill shop elsewheres