Concord NH to Bangor ME last Sunday. I took back roads from Concord to Portland (not 101, thats a highway), then highway to Bangor. The trip was 248 miles and I used 8.3 gallons. That averages to 29.87 MPG. Thats really not bad for winter formula, off brand gasoline, considering my car is rated for 28 highway, and I usually set cruise at 72-75.
Best ive done is 32MPG this past summer. I was headed from Bangor to Boston and it was 97 outside, I was not using AC, the AC made the engine run a little hot for my comfort.