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I install an Airaid system in my Hemi 5.7 and put it on the highway. I'm highly impressed with the increase in the MPG. A trip to Florida was around 21 MPH before the filter was installed. This photo was taken on a short road trip. Never seen it this high. Anyone else had the same results?
 

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I would suggest a longer term actual tracking of mileage (miles/actual gas pumped) would give you a better indicator... suspect there would be zero measurable difference.

fuelly.com gives you a great way to track fuel and mpg. My best tank was 27.2 mpg!
 
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