Just finished scanning this thread and wandering off into several of the linked threads as well. Nice work! I love how some folks painstakingly shape every inch while others more or less just "git 'er done" by whatever means.
I bought an aftermarket front undertray for my Fit shortly after I bought the car. It helped gas mileage incrementally, but the biggest improvement by far is that the car no longer gets pushed around by the airflow coming off semis or by high winds in general. Before the undertray the car was kinda squirrely in those conditions, no question about it. Now it's far more stable. Win-win.
My next under-car foray will be a rear diffuser. Nobody makes one so I'll have to fabricate, so thanks everyone for the tips and pics. I hope to have the same thing happen; better stability at speed, plus MPG improvement.
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