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Nice summary vid. I agree with the theory that the advantages of improved air flow are being cancelled out by the increased frontal area from the tabs themselves. This makes sense why the tabs were originally designed for semi's and rigs since their frontal area is already so large that the additional FA due to drag vortices from the tabs would not be as significant as the gains from airflow.
Neil's own tests with the tabs on his xA echo your results with no significant improvement (with evidence of actual decreased MPG)
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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