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I have a 2019 pro4x with a k&n cold air intake and a fitch fuel catalyst since adding the fuel catalyst my mpg has gotten way better. Before adding it I was averaging 16 to 18 mpg at around 65 to 70 mph on 93 octane. After adding the fitch fuel catalyst my mpg has been at around 21 to 23mpg at 65 mph on 87 octane gas. The truck idles more smoother and the exhaust fumes are not smelly as before the catalyst helps the engine burn the gas more complete. If you want to read up on it look it up here at https://fitchfuelcatalyst.com/automotive