I've previously tested this car and it does 50 mpg @ 50 mph with cruise control on a flat road.
This weekend I drove 60 miles each way on the highway with 3 passengers outbound and two returning. I ran mostly steady speed (but some strategic speed variance and downhill coasting) going out. Occasional AC and hills and light traffic roughly countered the mild techniques I used. I did full P&G EOC coming back. Both runs averaged 50 mph by the Scangauge (on purpose).
Out: 49.7 mpg @ 50 mph
Back: 60.2 mpg @ 50 mph
Same average speed, P&G EOC gave me 20% better mileage.