Combust Fuel Pills™ 6 Pack for Gas & Diesel Fuel

It wasn’t that bad for the price it wasn’t the biggest difference in the world either. It seemed like it helped.

These pills seem to have improved my car's exhaust emissions (much less smelly), but not the mpg nor the horsepower.I have a well maintained 2010 Mazda CX-7 with a 2.3L turbo 4 cylinder engine, all-wheel drive, and 30,000 miles on it. MPG is supposed to be 17 city/23 highway. My mpg is usually between 14 to 17, since I live in a congested and hilly area, where even some of the freeways are rolling hills. The only time I got 23 mpg was through a 100 mile freeway roundtrip while going 55 mph.After reading testimonials and videos showing how well other CleanBoost products work, (and trying other brands of fuel system cleaners), I thought I'd give this a try. So, with a tank full of Chevron Techron Super gas I did a 120 mile freeway roundtrip averaging 65 mph, with some short distance errand driving, and got only 17 mpg. So really, no effect.As to the horsepower, also nothing. In fact, there seems to be turbo lag while merging on the freeway, where there wasn't any before.