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To gain a better understanding as to why/how a tank bag would/could have an aero effect look at all the posts related to pick up truck box covers and canopies. The other example you might want to consider is the aerodynamics of a convertable with the top up and with the top down. I think we can agree that a convertable has lower drag with the top up. The motorcycle examples can be found on C. Vetter web site; he goes to cosiderable trouble to close in all openings as does janvos39 with his burgman scooter. Basic fluid dynamics also tells us that changes in cross section absorbe energy so that anything one does to eliminate unnessisary changes in cross section will help reduce drag. the tank bag will reduce the unnessisary change in cross section behind the fairing and between the rider and the fairing. An other example is the effort put into filling the in the space between the truck and the trailer on highway tracktor trailer units.
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