Is the 93 oct. custom performance worth the cash?
Currently my only custom tune is the 87 performance. I have an 07 Screw 5.4L with a K&N CAI and Flowmaster exhaust. I am getting about 14 MPG around town and about 17-18 on the highway. So my question is if I get the 93 performance tune will I get better gas mileage? Will I notice any change in performance? I know a lot of you have said you have seen a difference in mileage with the canned tunes. Any input would be appreciated.
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 Mike
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