Once you’ve packed up and hit the road, fuel becomes the main expense. If you’re not sure where to start, try a trip cost calculator like <a href="https://www.gasbuddy.com/TripCostCalculator" target="_blank" rel="noreferrer noopener">GasBuddy</a>. Unless you’ll be packing your own road trip snacks before leaving home, factor in money for dining out along your route, and you should also budget for the cost of filling your propane tank.