Good info guys. I still can't believe that the stock XF engine retards 30 degrees. Is that ATDC? Unbelievable. Now it makes sense why these aftermarket chipsets can make 10% more power than the stock tune. At over $6 a gallon for 103 octane, I guess this Toluene mix is fairly cost effective, dollar-for-dollar, even with the over-the-counter Toluene that I bought.

I just ran a 30 mile test on 10 gallons of 92 octane and 2 gallons of Toluene. Total equivalent octane is 96.

The engine felt much more powerful in the low rev ranges (subjectively speaking). Highway passing in sixth between 2000 and 3000 rpm was definitely more powerful with 96 octane than on straight 92 octane.

Strangely enough it felt as if the acceleration gets weaker between 3000 and 4000 rpm.

I can feel the car push me back into the seat between 2000 and 3000 rpm but then between 3000 and 4000 rpm it just feels flat. Don't get the wrong idea, this car is *fast*. But the difference is noticeable. More so now with the high octane fuel.