Answer
$= 21.8$ miles per gallon
Work Step by Step
1. Subtract the final and initial distance to find the distance travelled
$= 25,170.5 - 24,876.2$
$= 294.3$ miles
2. Let $x = $ the number of miles per gallon:
$13.5x = 294.3$
$x = \frac{294.3}{13.5}$
$x = 21.8$ miles per gallon