Welcome, and very nice image work.
I just installed grille blockers on my 12 Fiesta and guessing at 0.6 to 1 MPG gain. Although each car will be a little different. Haven t had a good time to do proper tests but I think I could tell by watching the Ultra Gauge.
I just started making aero-mods too and plan on making a few small changes to get the easy MPG increases. But all will tell you its your right foot that makes the larges difference.
Good Luck
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