I had a WRX STi, drank fuel like I dont know what......Its best fuel usage was.
30 Lts, too do..........28miles yes its true, it was a brand new WRX, The garage said it was normal. as the ECU needed time to "adjust"...WTF for the first 1500 miles.
I was also told that, if you use super unleaded, then use normal for a period of time, you totally screw the ECU and a new one will be needed, True or not, I dont know, but was what a Subaru mech told me. Not as fast as you think TBH or as nice to drive either.
Jut go for a 370 Z roadster like me