I have a 2013 GMC z71 with approx 60,000 miles on it. I noticed the can said use 1 ounce per gallon or 2 or more ounces when cleaning. Should I put 2 cans of it in my gas tank when I fill up my gas tank? Or can I add when the tank runs low and drive some more before filling the tank? What’s the best way and how much do I put in it? Thank you.