I don't pay much attention to MPG's, this car no longer travels out of town and anytime its on the interstate (usually only short bursts) the right pedal is on the floor. I rarely see anything over 19, but I also have heavy 19" VMR V710's with grippy Pilot Super Sports. I don't mind the low MPG because I live 2 miles from work and the past two years have only averaged 5k miles per year. My better half has a Honda CR-V that we take for out of town trips, the ZHP rides too rough with poly RTABS, FCABS 19" wheels and sport cup kit suspension.
EDIT: The last time I did take her out of town I took +/- 10 minutes and popped off the roof rack and stowed it in the trunk. I keep the roof-rack "key" in the tool kit in the trunk.