It looks to me like I can easily achieve 42 - 45 on non-interstate highway driving - even in moderately hilly country, now that the engine is a little bit less tight.
Air conditioning, which I had to use today, appears to reduce mileage by 3 to 5 mpg.
Also, having my signficant other at the wheel reduces mileage 3 to 5 mpg - throttle is too sensitive compared to previous car
Extex