Quick take: Build a realistic driving budget that includes the little expenses people forget.
Start with the real driving cost
Estimate distance and fuel spending using your vehicle’s realistic highway fuel economy and current fuel prices. Include tolls and parking. Do not assume a route with fewer miles is always cheaper if it adds tolls or overnight expenses.
Put lodging on its own line
Hotels can consume more of a road-trip budget than expected. Compare final charges, including fees, before booking. Some of the lowest advertised rates have restrictions that are expensive to change.
Plan for food and the unplanned
Set a daily food allowance, then build a separate buffer for snacks, attractions, extra parking, and unexpected changes. Keep emergency money separate from your entertainment budget.
Use a quick formula
Trip total = estimated fuel + lodging + food + parking/tolls + activities + contingency. The exact numbers change by season and route, so update the estimates shortly before travel.
Travel note: Prices, route conditions, schedules and rules can change. Check the relevant official sources and service providers before making bookings or driving.