What is a good fuel consumption rating in L/100km?

Fuel consumption varies widely by vehicle class and driving conditions. For compact gasoline cars, 6.0 to 7.5 L/100km (approx. 31–39 US MPG) is typical. Hybrid vehicles frequently achieve 3.8 to 5.2 L/100km (45–62 US MPG). Midsize SUVs typically range from 8.0 to 10.5 L/100km, while large trucks often register 12.0 to 16.0+ L/100km.

How do you convert L/100km to US MPG?

Divide 235.215 by the L/100km figure: US MPG = 235.215 ÷ (L/100km). For example, 235.215 ÷ 8.0 L/100km = 29.40 US MPG. To convert to UK Imperial MPG instead, divide 282.481 by L/100km (282.481 ÷ 8.0 = 35.31 UK MPG).

How do you convert L/100km to km/L?

Divide 100 by the L/100km figure: km/L = 100 ÷ (L/100km). For example, 100 ÷ 8.0 L/100km = 12.5 km/L. Conversely, dividing 100 by kilometers per liter returns L/100km (100 ÷ 12.5 = 8.0 L/100km).

Metric Fuel Efficiency Standard (ISO 7111 / SAE J1634)

Fuel Consumption Calculator

Fuel consumption describes how much fuel a vehicle uses over a given distance. Calculate liters per 100 kilometers (L/100km), kilometers per liter (km/L), and convert instantly to US & UK MPG.

Direct Fuel Consumption (L/100km) Calculator

Calculate L/100km, km/L, and equivalent MPG from fuel volume and distance

Distance Traveled

Fuel Consumed

Fuel Price (Optional)

$per liter

Fuel Consumption Rating

8.00L/100km

Lower is more efficient. Requires 8.00 liters to travel 100 km.

km/L12.50

US MPG29.40

UK MPG35.31

Trip Fuel Expense:$66.00

Cost Per Kilometer:$0.13 / km

How to Calculate Fuel Consumption (Formula & Step-by-Step)

Fuel consumption in liters per 100 kilometers (L/100km) measures the volume of fuel required to travel 100 kilometers. The mathematical formula is:

Fuel Consumption (L/100km) = (Fuel Used in Liters ÷ Distance Traveled in km) × 100

Example: 40 liters ÷ 500 km × 100 = 8.0 L/100km

Read full guide with worked real-world examples

What Is Fuel Consumption?

Fuel consumption is the volumetric rate at which an engine burns fuel to travel a standardized distance. Internationally, the primary standard is liters per 100 kilometers (L/100 km) throughout metric countries, alongside gallons per 100 miles used in specific engineering and comparative analyses.

Because fuel consumption quantifies the volume of fuel required to complete a fixed journey, a lower number indicates superior fuel efficiency. In contrast, fuel economy (such as miles per gallon or kilometers per liter) measures how far a vehicle travels per unit of fuel, where higher numbers indicate greater efficiency.

How to Measure Fuel Consumption (The Full-Tank Method)

Fill Tank & Reset Odometer

Fill your fuel tank to the first automatic nozzle shut-off click and reset your trip odometer to zero.

Drive Normally

Drive under your typical day-to-day conditions across your usual mix of city streets and highway driving.

Refill & Calculate

Refill to the first shut-off click. Record liters pumped and kilometers driven to calculate your exact consumption.

Fuel Consumption & Fuel Economy Formulas

Core mathematical relationships across international metric and imperial standards

Metric Fuel Consumption (Standard)

L/100 km = (Liters Used ÷ Kilometers Traveled) × 100

Computes the liters of fuel needed to drive 100 kilometers. To find kilometers per liter (km/L), invert the division: km/L = Kilometers Traveled ÷ Liters Used.

US Fuel Economy & Consumption

US MPG = Miles Traveled ÷ US Gallons Used

To express US consumption directly per 100 miles: US Gal/100 mi = (US Gallons Used ÷ Miles Traveled) × 100.

UK Imperial MPG & Important Unit Distinction

In the United Kingdom, fuel economy is calculated as: Imperial MPG = Miles Traveled ÷ Imperial Gallons Used.

Crucial Difference: US Gallons vs. UK Imperial Gallons

A US liquid gallon is approximately 3.78541 liters (231 cubic inches), whereas a UK Imperial gallon is defined as exactly 4.54609 liters—making the Imperial gallon approximately 20.095% larger.

Because the UK gallon holds more fuel volume, a vehicle achieves a higher numerical MPG rating in the UK than in the US for the exact same fuel consumption rate:

US MPG = 235.215 ÷ (L/100 km)
UK Imperial MPG = 282.481 ÷ (L/100 km)
UK Imperial MPG = US MPG × 1.20095

Step-by-Step Worked Examples (Metric & US Units)

Real-world sample calculations demonstrating exact formulas and multi-unit conversions

Example A: Metric Units

Distance traveled: 500 kilometers

Fuel refilled: 40.0 liters

Fuel price: €1.65 per liter

1. L/100 km: (40.0 ÷ 500) × 100 = 8.00 L/100 km

2. km per Liter: 500 ÷ 40.0 = 12.50 km/L

3. US MPG equiv: 235.215 ÷ 8.00 = 29.40 US MPG

4. UK MPG equiv: 282.481 ÷ 8.00 = 35.31 UK MPG

5. Fuel cost: (40.0 × €1.65) ÷ 500 = €0.132 / km

At €0.132 per km, driving 100 km costs €13.20 in fuel.

Example B: US Units

Distance traveled: 300 miles

Fuel refilled: 10.0 US gallons

Gas price: $3.50 per gallon

1. US MPG: 300 ÷ 10.0 = 30.00 US MPG

2. US Gal/100 mi: (10.0 ÷ 300) × 100 = 3.33 gal/100 mi

3. Metric equiv: 235.215 ÷ 30.00 = 7.84 L/100 km

4. UK MPG equiv: 30.00 × 1.20095 = 36.03 UK MPG

5. Fuel cost: (10.0 × $3.50) ÷ 300 = $0.117 / mile

At $0.117 per mile, traveling 100 miles costs $11.67 in fuel.

Approximate Illustrative Fuel Consumption Guide

Important Context: This table provides an approximate illustrative reference across typical passenger vehicle segments. It is not an official regulatory standard or universal rating system.

Real-world fuel consumption varies significantly based on vehicle curb weight, engine displacement, forced induction, hybrid powertrains, load and towing, roof racks, tire inflation, ambient weather, road topography, and individual driving style. For example, 9.5 L/100 km may represent commendable efficiency for a full-size crossover, but relatively high consumption for a subcompact city commuter.

Vehicle Class & Powertrain	Approx. L/100 km	US MPG	Imperial MPG	km/L	Operating Characteristics
Full Hybrid & Efficient Compactse.g., Prius, Corolla Hybrid, Ioniq	3.8 – 5.2	45 – 62	54 – 74	19.2 – 26.3	High urban efficiency via regenerative braking and Atkinson-cycle engine design.
Subcompact & Compact Sedanse.g., Civic 1.5T, Mazda 3, Elantra	5.5 – 7.2	33 – 43	39 – 51	13.9 – 18.2	Solid highway aerodynamics and efficient 4-cylinder turbocharged or naturally aspirated engines.
Midsize Sedans & Compact Crossoverse.g., Camry 2.5L, RAV4, CR-V	7.0 – 9.0	26 – 34	31 – 40	11.1 – 14.3	Standard performance for modern family passenger vehicles in mixed urban and highway driving.
Large Crossovers & Midsize Pickupse.g., Explorer, Highlander V6, Tacoma	9.5 – 12.5	19 – 25	23 – 30	8.0 – 10.5	Greater vehicle curb weight, larger frontal surface area, and optional all-wheel-drive systems.
Full-Size Trucks & High-Output V8se.g., F-150 V8, Silverado 1500, Tahoe	13.0 – 17.0+	14 – 18	17 – 22	5.9 – 7.7	Configured for high payload capacity, heavy-duty towing, or performance acceleration.

Fuel Consumption vs. Fuel Economy: What Is the Difference?

While frequently used interchangeably in conversation, fuel consumption and fuel economy are mathematically inverted concepts:

Fuel Consumption (L/100km or Gal/100mi): Measures fuel burned per fixed distance. Here, lower is better. A vehicle burning 6.0 L/100km consumes 40% less fuel over a trip than one burning 10.0 L/100km. Importantly, fuel consumption scales linearly with fuel burned and carbon emissions, making fuel cost budgeting straightforward.
Fuel Economy (MPG or km/L): Measures distance achieved per unit volume of fuel. Here, higher is better. A car achieving 35 MPG travels further on one gallon than a car achieving 20 MPG.

Common Mistakes When Calculating Fuel Consumption

Forgetting to multiply by 100: Dividing 40 liters by 500 km yields 0.08 liters per single kilometer. You must multiply by 100 to calculate the standardized 8.0 L/100 km rating.
Confusing km/L with L/100 km: 12.5 km/L is not the same as 12.5 L/100 km. If a car achieves 12.5 km/L, its fuel consumption is 100 ÷ 12.5 = 8.0 L/100 km.
Comparing US MPG directly to UK MPG: Because a UK Imperial gallon (4.546 L) is 20.095% larger than a US gallon (3.785 L), a car rated at 30.0 US MPG achieves 36.03 UK MPG without any change in engine efficiency.
Topping off after the pump clicks: Squeezing extra fuel into the filler neck introduces volume variance between fill-ups and can overwhelm your vehicle's evaporative emissions charcoal canister.

Frequently Asked Questions

Divide the liters of fuel consumed by the distance driven in kilometers, then multiply by 100: Fuel Consumption (L/100km) = (Liters ÷ Kilometers) × 100. For example, if your vehicle uses 40 liters to travel 500 kilometers: (40 ÷ 500) × 100 = 8.0 L/100km.