Virginia Driver Education And Traffic Safety (VADETS) Practice Test

The formula for determining gas mileage is based on how far a vehicle can travel on a certain amount of fuel consumed. Specifically, it involves dividing the number of miles driven by the gallons of gas consumed. This gives a clear measure of fuel efficiency, typically expressed in miles per gallon (MPG). Using this calculation, if a driver knows the distance traveled and how much gas was used during that distance, they can accurately assess their vehicle's performance and efficiency. This is crucial for understanding fuel costs and making informed decisions regarding driving habits or vehicle maintenance. In contrast, the other options do not accurately represent how gas mileage is calculated. The first option incorrectly uses the volume capacity of the gas tank without considering how much of it was actually consumed for the trip, leading to an inaccurate measurement. The third option incorrectly suggests a different division that does not correlate correctly with the calculation of mileage efficiency. Thus, option B is the correct choice for determining gas mileage.