Well I drove very slowly this last tank of fuel. And I have an Aeroforce intercepter gauge. It reads a lot of stuff including current MPG while driving. I left it on the MPG this whole tank and when cruising made sure it stayed above 30mpg. Filled up my tank today and I got what you see by the Ion redline 27.XX mpg
Oh well it's still decent for 242HP to the wheels (270ish at the crank)
2.0L Supercharged 4 cylinder.
Atleast my civic is sitting @ over 30mpg safely.