This is the balanced view in comparing your new Prius to another midsized 4c like a CamCord. For the same 9 min trip in very cold weather the CamCord likely would be getting FE ratings in the 25-27 mpg range. You are doing 50% better overall than other vehicles in what is a difficult commute for all vehicles. Try to pulse and glide then feather the pedal as much as possible during your short commute and then think of the benefit of living 9 min from work ( as opposed to one who has never lived and worked in the same state since 1981. ) There are always tradeoffs.