I've had little time to do much driving and the weather has been awful for any testing. This week we are warming up to the 30s so I might get some more data.
This morning driving to the bus about 30 miles on the freeway I got 19.3 MPG at normal freeway speeds (btw 60 and 70).
I might be able to do some higher speed testing this weekend at a higher ambient temperature. Maybe I'll even take some better photos