why is your car misfiring? which octane booster are you using? ive seen orange deposits on my sparkplugs using some octane boosters (NOS
) and i stopped trying that stuff a few years ago.
if your car is misfiring you have some other issue besides bad gas.. and bad gas is very uncommon anyway which leads me to believe you probably need to touch up a few spots with your tune?
On the other hand 13.6 is a great e.t., however your trap speed has room for improvement, like your car is laying over in 3rd and 4th gear or something.
Overall.. NICE DRIVING!