How to Calculate Fuel Costs for a Road Trip: Budgeting Tips for Long Drives

Planning a road trip is exciting, but fuel costs can quickly eat into your travel budget if you do not plan ahead. Whether you are driving across the country or taking a weekend getaway, knowing how to estimate your fuel expenses helps you budget accurately and avoid surprises at the pump.

The Basic Formula

Calculating fuel costs is straightforward:

Fuel Cost = (Total Distance ÷ Fuel Efficiency) × Fuel Price

Variable	Example	How to Get It
Total distance	600 miles	Google Maps or route planner
Fuel efficiency	25 mpg	Your car’s average or check the dashboard
Fuel price per gallon	$3.50	GasBuddy or local station prices

Using the example: (600 ÷ 25) × 3.50 = $84.00 for fuel. You can use our fuel economy calculator to quickly estimate your trip cost with your specific vehicle and route.

Factors That Affect Your Fuel Cost

• Driving speed — fuel efficiency drops significantly above 60 mph. Driving at 75 mph instead of 65 mph can reduce efficiency by 10–15%
• Vehicle load — every 100 lbs of extra weight reduces fuel economy by about 1%
• Roof racks and cargo boxes — aerodynamic drag can reduce efficiency by 5–25%
• Terrain — mountain driving uses more fuel than flat highways
• Air conditioning — using AC at highway speeds reduces efficiency by 3–10%

Fuel Cost Breakdown by Vehicle Type

Vehicle Type	Avg MPG	Fuel Cost per 100 Miles
Compact car (Toyota Corolla)	33	$10.61
Midsize sedan (Honda Accord)	30	$11.67
SUV (Honda CR-V)	28	$12.50
Pickup truck (Ford F-150)	20	$17.50
Minivan (Toyota Sienna)	24	$14.58

Based on $3.50/gal. Your actual costs may vary.

Tips to Save on Fuel During Your Trip

• Use apps like GasBuddy to find the cheapest stations along your route
• Fill up in suburban areas rather than near highway exits (prices are higher near interstates)
• Keep tires properly inflated — under-inflated tires reduce fuel economy by up to 3%
• Use cruise control on highways to maintain a steady speed
• Plan your route to avoid heavy traffic and construction zones

Before your next road trip, calculate your estimated fuel costs with our fuel economy calculator and build an accurate travel budget.