I've driven rt 84 thru ct lots. (grandma lives on the cape) I know what you mean about the long hills dragging down your average. I found my best bet was to really try and keep my momentum up by getting a good running start (driving with load) of at least 65mph. Then at the bottom of the uphill I'd go right to 40mpg & try to kick in assist to hold 40mpg for the hill. this way I could usually maintain >50mph- especially if I could get in behind a truck to wind break in front of me (not true drafting- about 5 car lenghts back)
if I hit the bottom of the hill at 55-60mph, I was usually at <50mph by the top and worrying about getting run over. This usually nets me 52-56mpg for trips from ny to the cape over 280 miles- though on the cape I can get high 50's to 60mpg so that usually pulls my average up.
locally/suburban- again, momentum is your friend. I try to be going 35-40mph at the bottom of the hill and again maintain 40mpg with boost going up.
I did do some experiments over a local mountain where I couldn't get a running start (stop & turn at bottom, with windey road). there the best results seemed again to be trying to keep the fcg as high as possible- but I usually ended up going 20mph at the top of the hill, which was unacceptable if another car was behind me. plus then the car downshifts and uses more gas anyway.
I think you really need to experiment with your own individual hills and approaches to work out what is the most fuel efficient and safe.
hope this helps. where in ct are you? east or west? I'm near the TZ bridge.
Kate

KLC
2005 HCH CVT 'Verdigeek'