Better mileage in a VX than an STi?! 
Now, granted, my VX is S/C'd and only sees the light on Sindays, I mean, Sundays. Roads are more barren, I have no real place to be, and driving it is simply fun. In the end, I turn out about 11-13mpg in the VX.
The STi is a DD. Two days of the week are stop and go traffic, the rest are usually quite tolerable. She does see Saturdays for cruising and errands. Saturdays are also for hanging with friends and simply put, ladies LOVE the STi, hahaha. So far, on average, I get 24-26mpg in the STi. No lie. Even other STi owners swear I am lying, but I kid you all not. She hasn't even seen any autoX yet. I say YET, though I don't think I am gonna go that route with her. The WRX got beat up enough in autoX. The new Borla catback arrives tomorrow so I am installing that this weekend hopefully so that Boxer can rumble and growl like it was meant to.
Gary Noonan
'01 S/C VX / '18 Forester XT