An airdam of your design should help. I agree with the comments above: better testing needed. And yes, driving style is my single biggest variable. Something else you might also try is always fuel at the same pump at the same station using the same method: slowest fill rate, stopping at the first click. This minimizes what can be very significant data-noise from pumping variations.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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