The best I've seen on the highway was 30mpg crusing at 80mph. But, it's usually in the upper 20s with my lead foot (120mph bursts, WOT when merging or passing).
I get about 25mpg mixed in the summer and 22mpg mixed in the winter (stupid oxygenated fuel!!!).
I LOVE my car!!! Completely flawless since I drove it off the lot with 7 miles on the odometer.
------------------
'99 SVT
Silver Frost/Midnight Blue
About as stock as they come these days.
"Drop a gear and disappear..."