Yeah, im running that stuff through my gastank right now. Already swapped the oil, really cleaned out the crap built up on my rockers/valves on my civic beater. If you are gonna use it in the gastank, as an additive, you want at least 8 gallons in your car. Even though the bottle says a gallon per howevermany ounces, trust me. It spiked my octane so high, i had a hard time keeping the engine running. Once i filled the remainder of the tank, problem vanished. Tho, now, my car is running really, REALLY rich. That stuff rocks as a cleaner. Its really helping my injectors/pcv system.

I havent run it through the TB yet, as my vacuum hoses dont wanna come off (it is a neglected beater, after all). So, either ill have to replace my main vacuum lines to my brake booster, or not use it. I need to run it through the IM, because its friggin hairy in there. Its nasty.

Hope that helps.

BTW: if you put it in your crankcase, i ran it for about 10 miles before changing the oil. After that, CHECK YOUR SPARK PLUGS. Luckily, i had some carbon build up on 2 of em, but it was cleanable. You dont wanna get stuck, after all