To find the mileage in miles per gallon (mpg), you can use the formula:
\[ \text{Mileage (mpg)} = \frac{\text{Total miles traveled}}{\text{Total gallons of gasoline used}} \]
Given that the motorcyclist rode 945.50 miles and used 30.5 gallons of gasoline, you can plug these values into the formula:
\[ \text{Mileage (mpg)} = \frac{945.50 , \text{miles}}{30.5 , \text{gallons}} \approx 30.95 , \text{mpg} \]
Thus, the mileage is approximately 30.95 miles per gallon.