I am consistently getting 43ish on my 33 mile commute in to DC, and 44 on the way home. The delta there is a combination of traffic pattern, heading up away from sea level, and the local hill gradients working more for me on the trip out of DC. I reset the odometer as soon as I get on the highway and am up to speed, otherwise the cold engine and 2 miles of local roads kills the # (notice my per-tank mpg is low-30s). I am convinced that a long drive will have no problem putting up the same numbers.