Tink,
Very impressive MPG over that long a road trip. I've had a 42 mpg run over 150 miles, but on 2-lane, little traffic and some 50-60 miles per hour miles. When I drive interstate, I stay with traffic, 70-80, depending on whether the limit is 70 or 75, and I've not been able to get more than 34 mpg at those speeds.
Lewis