I did an experiment. I drove one tankfull with the power switch on, and one with the power switch off. I calculated the fuel consumption each time and I didn't notice any significant difference. So now I normally keep the switch on all the time, except on long high-speed cruises.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II
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