[Benny986]

i agree with most octane boosters, not being worth a whole lot.

I use torco race fuel concentrate. I use this in a turbo car, and we bump the timing and boost. without the torco, we get pinging and timing gets retarded. so we know it works.

in the boxster, I fill up the car with about 10 gallons, and use a full can of torco (32oz) and that brings it to just about 100oct. i have a 100oct program on my chip, so for me it makes a difference.

if you are on stock programming, just stick with 91. if all you can find is 87, then just don't drive the car hard. baby it, don't rev it out, and when you find 91 again, use it. by the 2nd or 3rd full tank of 91, feel free to drive the car as it was designed : )

FWIW, my buddy runs about 1/3-1/2 bottle of torco in his C32 with safeway 91oct. and it went from getting 23.5mpg to 27mpg. YMMV hahah