I was looking for a fuel injector cleaner to treat a rough idle on my 2010 GMC Sierra. There was 30 products to choose from at my auto parts store. I decided to get Berryman’s because it was the only one in a metal can. I figured if it needs a metal can to contain it, it must be strong. I bought 2 cans. The first can straightened out the problem. I recommend to everyone and everyone has called me back to say thank you. I had a neighbor who did not drain his gas in his lawnmower for the winter. In the spring, he started it up and it was surging and would not rev up. I put about 2 ounces in the tank and told him to just let it idle for a while. Within a half hour, it stopped surging and ran like a champ. I now treat my lawnmowers with it. At the end of the season I put 2 ounces in the tanks and let them run until they run out of fuel. In the spring they start with one pull. I just noticed that my truck was getting 18mpg on a route that I take twice a week. I just put a can in and ran the route and got 19.5. With an increase of a 1 and a half mpg, X 100 miles, the stuff pays for itself. I now use it to clean throttle plates with a toothbrush. I love this stuff.