I installed this MAS on my 2014 Silverado. A MAS is not designed to provide a significant increase in performance and is not designed to increase fuel economy immediately. That being said, I assume these negative reviews of this product are likely due to an immediate/significant increase in performance/fuel economy. Factory GM trucks consume a lot of fuel. This MAS provides a more efficient air/fuel mixture. I felt a difference in throttle response and increased fuel economy. The throttle has more momentum. My overall fuel economy has increased by about 15-20 miles per tank of fuel, on average after driving about 700 miles. The fuel used also depends on your driving habits, i.e. if you have a front leg, more air is drawn into the engine, which increases the need for more fuel to use the air properly. My mileage increase is based on normal driving. Overall performance and increased fuel consumption depend not only on the reactive air mass meter. It is a combination of Jet Performance throttle body, high-flow secondary exhaust system, secondary air intake and performance optimization.
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