12-15-2011, 05:17 PM
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#17 (permalink)
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FRF Addict
Join Date: May 2011
Location: Alabama
Age: 58
Posts: 1,808
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Originally Posted by aalonso
I have now gained 2-3 MPG on city and highway driving.
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This is exceptionally unlikely. First, the displacement of the engine hasn't changed. Second, the optimum stoichiometric air/fuel mixture hasn't changed. Third, the fuel hasn't changed. Fourth, the weight of the vehicle hasn't changed. Fifth, the aerodynamics of the vehicle hasn't changed. Sixth, the same mpg increase for city vs. highway driving is completely specious. Sixth, any number of other CAI systsms (AIRAID, K&N, Volant, etc. do not produce such gains, and the Roush system is not significantly different.
If indeed this mpg increase is real, which I sincerely doubt, it's due to a change in driving habits. More than likely the Roush system is louder than stock (as is my AIRAID system), and due to the additional intake noise the driver is going lighter on the throttle. That'll go away (as it did with my AIRAID system) as the driver gets accustomed to the additional intake noise.
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