Fuel Cost Calculator
Calculating Your Trip's Fuel Cost
Planning a road trip or commute? Knowing your fuel costs helps you budget accurately. Our calculator works with both US (MPG, gallons) and metric (L/100km, liters) units.
Fuel Cost Formula
The basic formula for calculating fuel cost is:
Fuel Cost = (Distance ÷ Fuel Efficiency) × Fuel Price
For example: A 300-mile trip with a 30 MPG car at $3.50/gallon costs: (300 ÷ 30) × $3.50 = $35.00
Average Vehicle Fuel Efficiency
| Vehicle Type | MPG | L/100km |
|---|---|---|
| Compact Car | 32 MPG | 7.4 L/100km |
| Mid-size Sedan | 28 MPG | 8.4 L/100km |
| SUV | 23 MPG | 10.2 L/100km |
| Pickup Truck | 18 MPG | 13.1 L/100km |
| Hybrid | 50 MPG | 4.7 L/100km |
| Electric (MPGe) | 120 MPGe | 2.0 L/100km equiv |
Tips to Save on Fuel
- Maintain tire pressure: Properly inflated tires can improve MPG by 3%
- Drive smoothly: Avoid rapid acceleration and hard braking
- Use cruise control: Maintains constant speed on highways
- Reduce idling: Turn off engine when stopped for more than a minute
- Remove excess weight: Every 100 lbs reduces efficiency by 1-2%
- Plan routes: Avoid traffic and combine errands
Frequently Asked Questions
How do I find my car's fuel efficiency?
Check your owner's manual, the sticker on the driver's door, or look up your vehicle on fueleconomy.gov. City and highway MPG are usually listed separately--use the combined figure for mixed driving.
What affects fuel efficiency?
Speed (55-65 mph is optimal), weather conditions, road terrain, vehicle maintenance, tire pressure, air conditioning use, and driving habits all significantly affect fuel consumption.
How much does AC affect fuel economy?
Air conditioning can reduce fuel economy by 5-25%, depending on conditions. At highway speeds, AC is more efficient than open windows. At low speeds, windows down is better.
Is premium gas worth it?
Only if your car requires it. Using premium in a car designed for regular gas typically provides no benefit and wastes money. Check your owner's manual for the recommended octane level.
How do I convert between MPG and L/100km?
To convert MPG to L/100km: divide 235.215 by MPG. For example, 30 MPG = 235.215 ÷ 30 = 7.84 L/100km. Lower L/100km means better efficiency.
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