On a long holiday road trip, the easiest cost to overlook is fuel. A 1,200-mile drive can cost more in gas than a train ticket. Budget ahead with a calculator and hit the road with confidence.
The Fuel Cost Formula
Fuel cost = (miles ÷ 100) × fuel per 100 miles × fuel price
Of the three variables, fuel consumption per 100 miles is the easiest to misjudge — real-world consumption often runs 10–20% above official figures.
Key Factors Affecting Fuel Economy
- Highway vs city: steady highway cruising is most economical; stop-and-go city traffic is worst
- Air conditioning: AC adds about 10% consumption in summer
- Vehicle load: a full load uses 5–15% more fuel than empty
- Driving style: hard acceleration and braking burn 20%+ more than steady driving
Worked Example
A 700-mile trip, a sedan doing 7 L/100km, gas at $1.10/L:
With the fuel calculator: one-way fuel cost ≈ $54, round trip ≈ $108.
Add tolls of roughly $80 each way, and the round-trip total lands near $268.
Fuel-Saving Tips
- Check tire pressure before leaving — under-inflation increases fuel use
- Hold 60–70 mph on the highway for best economy
- Use the discount calculator to find fuel discounts along the route
- Compare route costs with the fuel calculator when planning
Next time you travel, open the fuel calculator first, budget properly, and drive off worry-free!