To convert kilometers to miles, you can use the conversion factor that 1 mile is approximately 1.61 kilometers.
Given that Timmy's van travels 30 kilometers per gallon of fuel, you can convert that to miles using the formula:
\[ \text{miles} = \frac{\text{kilometers}}{1.61} \]
Substituting the value:
\[ \text{miles} = \frac{30}{1.61} \approx 18.64 \]
So, Timmy's van travels approximately 18.64 miles per gallon of fuel.