Sorry to leave you hanging, Rooster. My free time vanished for a while.
I fastened a piece of aluminum sheet behind the grille and have been driving the Vic back and forth to work. No obsessive hypermiling, just every day, average driving and I'm creeping up on a 25 mpg average!
'99 Crown Victoria
'97 Impreza 2.2, 5-speed
'98 Impreza Outback Sport 2.2, 5-speed
'05 Outback 3.0R (wife's)