Fuel Mileage Calculator
Calculate your vehicle's fuel efficiency in MPG (miles per gallon) or L/100km. Track your mileage over time and see how your driving habits affect fuel economy.
Your Efficiency vs. Vehicle Types
Fuel Mileage Tracker
Track your fuel efficiency over multiple fill-ups to see trends
Efficiency History
Fuel Efficiency Standards by Year
Understanding Fuel Mileage: The Complete Guide
Fuel mileage, commonly expressed as miles per gallon (MPG) in the United States or liters per 100 kilometers (L/100km) in most other countries, is a crucial metric for understanding your vehicle's efficiency. This comprehensive guide explains everything you need to know about calculating, tracking, and improving your fuel mileage.
What is Fuel Mileage?
Fuel mileage measures how efficiently your vehicle converts fuel into distance traveled. It answers the fundamental question: "How far can I drive on a given amount of fuel?"
MPG = Distance Traveled (miles) ÷ Fuel Used (gallons)
Example: 350 miles ÷ 12 gallons = 29.2 MPG
L/100km = (Fuel Used in Liters ÷ Distance in km) × 100
Example: (45L ÷ 560km) × 100 = 8.04 L/100km
What is Good Fuel Mileage?
Good and decent fuel mileage ranges from 29 to 33 miles per gallon and above (or 8 to 7 L/100km and below). However, what's considered "good" depends on your vehicle type:
| Vehicle Type | Poor MPG | Average MPG | Good MPG | Excellent MPG |
|---|---|---|---|---|
| Compact Car | <25 | 25-32 | 32-40 | >40 |
| Mid-size Sedan | <22 | 22-28 | 28-35 | >35 |
| SUV | <18 | 18-24 | 24-30 | >30 |
| Pickup Truck | <15 | 15-20 | 20-25 | >25 |
| Hybrid | <35 | 35-45 | 45-55 | >55 |
Converting Between Fuel Efficiency Units
| MPG (US) | MPG (UK) | L/100km | km/L |
|---|---|---|---|
| 20 | 24.0 | 11.8 | 8.5 |
| 25 | 30.0 | 9.4 | 10.6 |
| 30 | 36.0 | 7.8 | 12.8 |
| 35 | 42.0 | 6.7 | 14.9 |
| 40 | 48.0 | 5.9 | 17.0 |
| 50 | 60.1 | 4.7 | 21.3 |
- MPG (US) to L/100km: 235.215 ÷ MPG
- L/100km to MPG (US): 235.215 ÷ L/100km
- MPG (US) to MPG (UK): MPG × 1.20095
- MPG (US) to km/L: MPG × 0.425144
How Far Can You Travel Per Liter?
A useful way to think about fuel efficiency is how many miles or kilometers you can travel on just one liter of fuel:
| Vehicle Efficiency | Miles per Liter | km per Liter |
|---|---|---|
| 25 MPG (avg sedan) | 6.6 mi | 10.6 km |
| 30 MPG (efficient car) | 7.9 mi | 12.8 km |
| 35 MPG (very efficient) | 9.25 mi | 14.9 km |
| 50 MPG (hybrid) | 13.2 mi | 21.3 km |
Tips to Improve Your Fuel Mileage
Avoid rapid acceleration and hard braking. Aggressive driving can reduce fuel economy by 15-30% at highway speeds.
Regular maintenance including oil changes, air filter replacements, and tune-ups can improve mileage by up to 4%.
Under-inflated tires can lower gas mileage by about 0.2% for every 1 PSI drop in pressure across all tires.
Remove unnecessary items from your car. An extra 100 pounds can reduce MPG by about 1%.
Air conditioning can reduce fuel economy by 5-25%, depending on conditions and vehicle.
Combine errands and avoid rush hour traffic when possible. Stop-and-go driving significantly reduces efficiency.
How to Track Your Fuel Mileage
- Fill your tank completely and reset your trip odometer
- Drive normally until you need to refuel
- Fill up completely again at the same type of pump
- Record: Miles driven, gallons added, and price paid
- Calculate: Miles ÷ Gallons = MPG
- Repeat over several fill-ups for accurate average
Frequently Asked Questions
Good fuel mileage ranges from 29 to 33 MPG and above (or 8 to 7 L/100km and below) for standard gasoline vehicles. Older models and heavier vehicles typically get lower mileage, especially in city driving. Hybrids can achieve 45-55 MPG, while some plug-in hybrids exceed 100 MPGe.
A car with 30 MPG can travel approximately 8 miles (12.875 km) on one liter of fuel. A more efficient vehicle at 35 MPG can reach up to 9.25 miles (14.8 kilometers) per liter. The exact distance depends on your vehicle's specific fuel efficiency.
EPA ratings are determined under controlled conditions that may not match real-world driving. Factors that cause variation include: driving style (aggressive vs. conservative), traffic conditions, weather/temperature, terrain, A/C usage, vehicle load, and maintenance status. Most drivers achieve 10-20% lower than EPA estimates.
Generally yes, for conventional vehicles. Highway driving at steady speeds (typically 45-65 mph) is more fuel-efficient than city driving with frequent stops and starts. However, the difference is smaller for hybrids, which can recapture energy during braking and are often more efficient in city driving.
Fuel efficiency typically peaks around 45-55 mph for most vehicles. Above 50 mph, fuel economy drops rapidly due to increasing aerodynamic drag. Each 5 mph above 50 mph is roughly equivalent to paying an additional $0.20 per gallon. Driving 70 mph instead of 55 mph can reduce fuel economy by 17-25%.