1. **State the problem:** We want to find out how many gallons of gas are used for every 1 mile driven if the car's fuel efficiency is 28.01 miles per gallon (mpg). 2. **Formula:** Fuel efficiency is given by $\text{mpg} = \frac{\text{miles}}{\text{gallons}}$. 3. **Find gallons per mile:** We want gallons per mile, which is the reciprocal of mpg: $$\text{gallons per mile} = \frac{1}{\text{mpg}}$$ 4. **Calculate:** $$\text{gallons per mile} = \frac{1}{28.01}$$ 5. **Simplify:** $$\text{gallons per mile} \approx 0.0357$$ 6. **Interpretation:** This means for every 1 mile driven, approximately 0.0357 gallons of gas are used.