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I think the point being discussed is that WAI's suck, it's basically reducing your WOT HP potential of your engine.
If you have a ram air setup, it's irrelevant because the throttle body will just be open a little less to provide X-HP worth of air to cruise the car down the road.
Btw 14.7:1, while being the "optimal" fuel number, isn't always so.
When I had my ECU chipped and tuned for my Civic, we were running a wideband and got the cruise AFR to 16.0:1 before it started to lean pulse. That's 8.8% better efficiency right there, and I saw an increase in cruise mpg of 2-3 MPG.
Now if I had a crappy WAI I'm sure I would have ran into detonation before that point and would be running a more 14.7ish AFR...
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