By the way, do NOT put this in your tank and let the car sit. It's so damn strong it can cause damage to rubber parts in the gas tank. Also, don't use it more than 15-20 tankfuls, depending on how you drive. It can mess up TPS and IAC motors because it does such a good job dissolving varnish, and too much can also mess with o-rings in the throttle body.
Been there, done that, when I used to get the stuff for free and decided to run a bottle in every tank. Keep eating up IAC on my Chrysler work car about every 15K and finally figured out that while it made my gas mileage go up by 1.5-2 mpg pretty consistently, it was dissolving the insides of the IAC...LOL.