Thanks for the link.I have to set my MPG expectations at 42 because, in France, the highway I drive twice a week is very windy, full of hills and the average driver runs at around 135 km/h (83 mph). I know, it's insane and for safety's sake I have to keep up... So my "sweet spot" is around 110 km/h (68 mph) and I stress out every time I have to pass a semi. My Fuelly dashboard is depressing.
You seem often challenged with heavy traffic and haul lots of weight, add the higher speeds and wind loading and ya get mpg eating conditions. Yet you are still getting mpg's at or above the EPA predictions. I wouldn't be depressed, I'd be pleased.
Two things I suggest to maybe do a little better.:
Check tire pressures once a month. Especially with the cold of winter coming soon. The recommended tire pressure numbers are good. An additional 2-3 psi is perfectly safe, and may yield better handling with extra weight in the car. I and others getting 50mpg+ go higher.
Second, on the energy flow screen, try driving as much as you can with the gas pump icon dark and an active arrow from the battery to the car icon. It takes a light touch on the gas pedal, but you are getting 150mpg, and running exclusively on electricity stored in the battery. Make good use of those hills by recharging the battery on downgrades. Use your left foot to very lightly tap the brake pedal, but so lightly you are not actually braking/slowing down. This will put some extra energy into the battery for later use in battery only operation ( "EV mode").
See "Blue Bird" 2010 Insight at Fuelly for my mpg and commentary.