Last week was just a tick over 23 mpg using the AC. I'm driving this week without AC to see if it goes up from there since the AC system seems to put such a strain on the car that it will stall or nearly stall if you start it up with the AC on.
This is only my third week driving the car. So far I have calculated 22.xxx mpg driving like an ass the first 2 days (flooring it to see how fast it will go from a dig) and now the 23.xxx from last week.
It sure is nice to press the 87 button at the pump instead of the 93.

Also nice to only fill up once a week instead of twice.
Oh, and my driving is a mix of about 50% highway stop and go, 40% highway @ 65-70 mph, and 10% city.
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Official Mustang Evolution Lake George Meet 2009

2.2L KB Supercharger, 4#, Billetflow Single Blade TB, JLT Carbon Fiber RAI, Nazty Performance Ported Lower Intake, Bassani Midlength Headers, O/R H-Pipe, Borla Stinger Catback, Tuned by
RWTD --- Numbers coming soon...