My wife and I bought a 2013 Prius 2 a couple of weeks ago. We just went through the first complete tank. The dash states that we averaged 45 mpg. I was really hoping that would be higher but its twice what we were getting out of our Camry. Upon further inspection my calculations are showing that we are getting significantly less than the 45 mpg. The dash is saying that we drove 440 miles on the tank, divide that by 12 gallons and you get 36 mpg. This is a far cry from the 45 mpg that the dash is saying and even more so to the 51/48 that the manufacturer has stated. What gives here? Why am I only getting 440 miles to a tank? At 45 mpg i should at least get 540 miles.