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A ScanGuage (or UltraGauge) will be a big help. Sometimes you can lift your right foot so slightly and not even slow down - and you'll gain 10-20MPG on the instant FE gauge. If you do this consistently, then your overall FE goes way up.
I have at least five or six fillups that are 11.6+ gallons.
Do you have the upper grill blocked? That alone was worth 2-3MPG for me.
I agree the tape looks pretty lousy from a purely aesthetic point of view. The Coroplast is fading a lot in the ~5 years it has been on the car. But all the aero mods in total raised my FE 6-8MPG. My best tank went from ~42MPG to over 55MPG.
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