The math has already been done for you.
For your 2013 people average 27.1MPG. at $2.7 per gallon, you are looking at 9.96 cents per mile.
http://www.fuelly.com/car/scion/fr-s
Your math is way off. Cost per mile is just your fillup cost / miles driven, nothing else. So even if I were to use your full tank, $2.7 x 13.2 / 477 = $0.0747