The only way to get noticeable fuel economy gains and SUBSTANTIAL HP and torque increase is to combine the spoiler with truck nutz. And for a nitrous oxide-like boost in stop light to stop light acceleration, apply an "Ain't Skeered" sticker approximately 2" below the top of the rear window. Measure carefully! And for the truly daring, I've heard that chew spit is an outstanding traction assist compound for those back road 1/8 mile romps against your buddies IROC! Be sure to post any results you achieve with these time tested performance enhancements!