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I once had a pinched nerve due to a pulverized L5-S1. The chiropractor said he believed I could be rehabilitated if I saw him for "adjustments" 40 times over the course of 2 months.
Instead of doing that, I did nothing and my back got better over the course of 2 months. Had I completed the 40 adjustments, I would have attributed my healing to the so-called doctor.
My point is that there's too many variables at play to even suggest a result was achieved by a particular action.
It's possible it did improve fuel economy, and it was probably a worthwhile upgrade if the wiring was as poor as you say.
That said, it didn't give you a 12% fuel economy increase. It's not mathematically possible as Jakob alludes to.
If ignition performance were really poor, it would trigger a CEL.
Roof racks can make a huge difference though.
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