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My R/T is all stock, except for the wheels/tires. I bought a used Diablosport Predator to change the wheel/tire size so my speedometer would read correctly. I also installed a K&N CAI. I saw in the tuner a setting for CAI/91 octane fuel and thought, "What the hell, I'll give it a try!" To my surprise, the MPG (highway) went from 20 to 24! I'm a happy guy! Just hope it passes smog (I'm in Cali).
 

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That's pretty good! I never saw an increase, but that's because I have a lead foot and traffic sucks on the 91! Don't worry about the smog check. I just recently did mine on my Magnum with the canned tune. Just put the stock air box back on, removed the catch can and passed with no problems.
 

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Nice one! I just installed my Afe stage2 CAI that I bought from 4WheelOnline.com. No noticeable hp or mpg gain but I love the sound of it. My next plan is to have a tuner also though I'm not sure which one to get.
 
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