I have about 2500 wonderfull miles on my Prius. Up until the last tank full I was using Mobil (yes I know that they are an evil company) gas. My wife said to me that maybe I should try the no name station down the road because its 10 cents cheaper. Well I did and so far into this tank (3 PIP till empty thank God) I have been getting 44.4 ~ 44.7 cant get above that number. I have checked the tire 42/40, drove the same speed and the same route, the temp has been warmer by about 10 ~ 15 deg. My gut feeling is telling me its the fuel. Is this true has anyone else found this to be true?