In a GP? I mean, I could get stupid mileage out of an Echo.
I typically hit every red light and get 16-18 MPG city and I don't let the damn thing past 3K RPM 90% of the time. I don't use the highway but country roads doing 90 km/h (56 mph) I'll get 25-28 MPG so I know the car works properly, just don't drive on what they consider an "ideal" streets.