I've had my SEL for a week now, drive 19 miles, 75/25 highway/city driving.
I've got a heavy foot and driving this car "spiritedly" I am still getting between 26 and 30mpg with only 350 miles on the car. It's better than the 17mpg I was getting out of my Chev Colorado and is heaps better drive and look at.
I've got a 1300 mile trip coming up next week which will be 98% highway driving. Should be a good test for the little hot hatch.