I'm running the Cobb Stage 2 OTS 93 Octane Map and people with similar mods keep track of their MPGs??
Cobb DP, Cobb TBE, Cobb Main Pulley, COBB SFI.
Driving like the teen STi driver highway/city I average 15.3 MPG.
I don't gun it at every light or anything, but I shift around 3-4 K and average...