Fuel Cost Formula
With MPG: Cost = (Miles / MPG) × Price per gallon
With L/100km: Cost = (Distance km / 100) × L/100km × Price per litre
Average Fuel Efficiency by Vehicle Type
| Vehicle Type | US MPG (avg) | L/100km (avg) |
|---|---|---|
| Compact sedan | 30–38 MPG | 6.2–7.8 L |
| Mid-size sedan | 25–32 MPG | 7.4–9.4 L |
| SUV / Crossover | 22–28 MPG | 8.4–10.7 L |
| Pickup truck | 17–24 MPG | 9.8–13.8 L |
| Hybrid | 40–55 MPG | 4.3–5.9 L |
| Electric (MPGe) | 90–140 MPGe | N/A |
| Motorcycle | 40–60 MPG | 3.9–5.9 L |
Fuel Saving Tips
- Maintain proper tire pressure — under-inflated tires can reduce fuel economy by 0.5%–3%.
- Avoid aggressive acceleration and hard braking — smooth driving can improve efficiency by 10%–40%.
- Use cruise control on highways — maintains a consistent speed and reduces unnecessary acceleration.
- Remove roof racks when not in use — aerodynamic drag reduces fuel economy at highway speeds.
- Don't idle unnecessarily — idling for more than 60 seconds uses more fuel than restarting.
- Service your engine regularly — a well-tuned engine runs more efficiently.
Frequently Asked Questions
How do I convert MPG to L/100km?
Use the formula: L/100km = 235.21 ÷ MPG. For example, 30 MPG = 235.21 ÷ 30 = 7.84 L/100km.
Does speed affect fuel consumption?
Yes significantly. Most vehicles are most efficient between 45–65 mph. Above 65 mph, aerodynamic drag increases rapidly and fuel economy drops noticeably — typically 7%–14% for every 10 mph over 65 mph.
How much does air conditioning affect fuel economy?
AC can reduce fuel economy by 5%–25% depending on conditions. At highway speeds, AC is more efficient than opening windows (which creates drag). In city driving, windows-down is generally more efficient.
What is the difference between city and highway MPG?
City driving involves frequent stops and starts which are fuel-inefficient. Highway driving is more consistent and efficient. Most vehicles achieve 20%–40% better fuel economy on highways than in city driving.