The fuel efficiency (in miles per gallon of gas) of a car is given by the expression -0.02 v2+1.5 v+2, where v is the speed of the car in miles per hour. Find the fuel efficiency when v=45 {mph}.
a) 24.75 mpg
b) 25 mpg
c) 25.25 mpg
d) 25.5 mpg