Gas mileage went up, extremely happy bc gas prices just shot up. Travel for work & saves me money.

Fuel system cleaner from combustion chamber to piston rings to especially intake valves, this also cleans the entire fuel system including the fuel pump, use acquired amount indicated on back of container for the size of your fuel tank, caution do not add too much because you can also change the volatility of your fuel in your tank and create problems?

This product really works, i used on a high mileage vehicle and definitely saw an improvement in fuel consumption and car seems to run smoothly. Also 1 bottle treats up to 160 gallons which is a good value for the price.

Update 7-7-2017
I just read the destructions. I've been adding it every fill-up, but should start adding it every fourth. I burn a tank a week, so I'll just add it once a month.
End update
My air filter was contaminated when a body shop removed my front bumper and let the filter fall into an oil puddle. My gas mileage plummeted after that happened. I had the injectors cleaned, and that helped, but only to a point. My mileage never got back to where it was before the repair. My plugs probably were also contaminated, and you can't clean these (special 120K mile) plugs.

I started a new job that involves a lot of freeway driving - about 80 miles round trip. My mileage went up because of the highway driving, then plateaued. As soon as I put an ounce of this optimizer in, the mileage seemed to improve, albeit slowly. I run AmsOil synthetic, and use MotorKote oil treatment, too, so I figured there wasn't a lot of room for improvement. I sort of accidentally put too much in one fill-up, and my mileage is now improving a lot faster. I just started my second bottle, so I think I'll get the multi-pack next time around.

Works great