Bingo. WNJ, you are driving at about the most efficient speeds that you can w/this car, as you should be in 6th gear at those speeds. And I'll bet slower overall on the uphills than the downhills? Throw in some traffic, and I'd bet you'd hit 50MPG! The biggest efficiency benefit to a hybrid is the regen braking. But WNJ is probably getting plenty of battery charging on those downhills!