I have not done any mileage studies, yet. Soon come ....
I did install the 93 Tune ( dyno tuned for my truck ) today, filled with 93 Amoco and went for a test drive.
What a kick in the arse the combo of the C & L and Doug's (
http://www.bamachips.com/ ) 93 Tune made.
Very impressed with the combo. A trip to the dyno (
http://proautotech.com/ ) is in the works.
Jeff, glad to see that it works in your Mustang; now get one for the new truck ....