I tend to shift out of first right around 3k when the car is warmed up- I just find it smoother around 3k than around 2k. When I commuted 25 miles a day to work which was suburb to city and back, I was getting 29-31mpg if I remember correctly.Last night I drove as carefully as I could, coasting while in gear, accelerating slowly, shifting out of 1st gear ASAP, and I averaged just below 30mpg, half city half highway.
Not bad I guess, but I was driving like a complete granny. I bet with summer gas and summer tires on I'll be able to get 30mpg while driving a bit more spiritedly.
One of my main issues I think was holding 1st gear until like 3.5k rpm. That eats gas every time you start from a complete stop. Now I'm shifting into 2nd right away and it seems to help