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Gas Mileage with JB4 Insalled

3K views 0 replies 1 participant last post by  caoman911 
#1 ·
Maybe it's me but...I think I'm getting better mileage as a result of installing the JB4. In addition the car behave so much more smooth. I'd like to know if this is a vlid perception or just perceptual hype.:dunno:
 
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