What is the Road Trip Gas Calculator?
The Road Trip Gas Calculator is a budgeting tool for travelers. By taking the total distance of your driving route, your vehicle's average highway fuel economy, and the estimated price of fuel along the route, it calculates exactly how much money you will spend at the pump during your vacation.
How to Calculate Total Road Trip Fuel Costs (Formulas)
The calculation requires you to estimate how many total gallons you will burn to cover the distance.
- Gallons Required Formula: Total Distance of Trip in Miles / Vehicle MPG.
- Total Cost Formula: Gallons Required * Average Cost per Gallon.
- Example: A 1,000-mile trip in a car getting 25 MPG will burn 40 gallons of gas. At $3.50 a gallon, the trip costs $140.
Frequently Asked Questions
How accurate is a road trip gas estimate?
Calculators assume you will drive at a constant highway speed on flat ground. In reality, hitting massive traffic jams, idling in drive-thrus, driving over steep mountain passes, and strapping heavy luggage boxes to the roof of your car will drastically lower your MPG, meaning the trip will cost more than the initial estimate.
Is it more fuel-efficient to use cruise control?
Yes, on perfectly flat highways. Cruise control maintains a mathematically steady throttle, preventing the micro-accelerations caused by a human foot that burn excess gas. However, in hilly or mountainous terrain, cruise control will aggressively downshift and floor the engine to maintain speed up a hill, which actively wastes fuel.
Should I run the AC or roll down the windows on the highway?
Running the air conditioning compressor drains a small percentage of engine power, lowering fuel efficiency. However, at highway speeds (over 55 mph), rolling down the windows destroys the aerodynamic profile of the car. The massive air resistance creates so much drag that the engine must work significantly harder to overcome it, burning far more gas than the AC ever would.