Well, Tonite I got to two cliks on the fuel gauge on my first tank, dealer filled. I decided to go ahead and fill up. Avg temp has ranged 20-40 degrees F. I had driven 351 mi. Filled it till the pump cliked off and it took 7.352 gallons. Not bad for my first tank used in my 500mi. per week commute. Avg. 47.74 mpg. MFC indicated avg was 45.6....Not a bad descrepancy 2.14 gals. I am very pleased.
Yeah! That is what I am talking about. ... Great mpg #'s. I am easy on the throttle and keep my speed almost constant on the highway. Enjoy your prius and drive safe.