We do very little highway driving and my wife's commute is only a little over a mile each way and when I drive it I'm a little heavy on the skinny pedal and I am impressed with the solid 26-28mpg we've been getting since new.
Using premium nets us only 1-2 more mpg than mid grade but we stick with it.
'12 Focus Red Candy SE Sport 5 spd
'99 Toyota 4Runner Sport
'11 Subaru WRX STI Hatch