Lucas 32 oz. will treat 100 gallon. Know they sale all size containers.
Have one gallon and two quarts in garage now. I don't use Lucas all the time but use some brand each tank.[I think it is good insurance] Have 214,000 miles on 6.5 GMC Surbuban never a problem and pulled 30foot tavel trailer...
Have a 6.5 and a 6.6,the 6.5 has 213,000 miles and no problems.
Best vehicle ever owned in my 55 years of driving.
Just hope the 6.6 will make another 150,000 to match that.