tis the season for subarus. The electrical physics of a tropical storm zapping the east coast is energizing the flux capacitor.
I gave up measuring my own for accuracy, I leave ut underestimated, after a sure 48mpg, I only have gas bills and google maps and odometer. a scanguage would put my little sube at 52 or more (haven't met my 60s mpg since 2004- that requires a natural hho maker). I could guess with an imperfect friction filled boxer, you got a perfect head leak.
Is the oil pan nice and glossy...a tip for you...