How much is your premium gas? I am computing 27g here at $3/g at your .11/mi rate.
So this means my wife's Prius would be about $3333 for 50K miles. Bleh.
I used $2.45/gallon and $0.195/kWh. From-the-wall usage is 523Wh/mi, also adding in 70 watts continuous vampire drain, over 4 years, with 91% charging efficiency.