Timmy's van travels an average of 30 kilometers per gallon of fuel. How many miles does Timmy's van travel per gallon of fuel? Use 1 mile is equal to about 1.61 kilometers, and round to the nearest tenth of a mile.

A. 186
B. 28.4
C. 48.3
D. 18.6

To convert kilometers to miles, we can multiply by 1 mile/1.61 kilometers. So, Timmy's van travels 30 kilometers per gallon of fuel * 1 mile/1.61 kilometers ≈ 18.6 miles per gallon of fuel. The answer is D.