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660cc car fuel average cannot be assigned reliably from engine size alone. A Japanese import badge may cover several years, grades, turbo options and drivetrains. An article updated in 2026 may still describe an older car. This guide helps identify the right source figure and measure the actual car instead of promising that every 660cc model achieves the same mileage.
Record the inputs before calculating
Record model year, chassis or model code, grade, engine, turbo status, transmission, 2WD/4WD and original market. Check whether the source figure is Japanese WLTC, older JC08 or another test. These are different procedures; a unit conversion does not make the tests equivalent. Use dated manufacturer information. A Japanese mild-hybrid Alto figure should not be assigned to the Pakistan-market Alto.
Worked example and formula
Illustrative numbers only. Replace every assumed measurement, price, rate and performance factor with evidence for your situation. A 2026 review date does not turn an example into a current market quotation.
300 km / 20 L = 15 km/L
100 / 15 = 6.6667 L/100 km
300 PKR/L / 15 km/L = 20 PKR/km
1,000 km × 20 PKR/km = PKR 20,000
In a fictional measurement, 300 kilometres between comparable full-tank refills uses 20 litres. The result is 15 km/L, or approximately 6.67 L/100 km. At a hypothetical PKR 300 per litre, fuel costs PKR 20 per kilometre and PKR 20,000 for 1,000 kilometres. None of these figures is a claimed Alto, Mira or N-BOX specification or a current pump price.
Interpret the result correctly
Repeat measurements over several tanks and record traffic, AC use, load, route and refill method. A dashboard reading, a short motorway run and a combined laboratory result answer different questions. Do not average different variants and call it a particular car’s guaranteed result. Official test numbers remain useful for comparison within a consistent procedure, not as a promise for every road.
Keep the original measurements, source date, units and assumptions beside the result. Change one assumption at a time to see its effect. A comparison is meaningful only when both options use the same scope. Do not silently combine different test procedures, products, dates or fee bases. Round a purchasing quantity upward only after completing the calculation; retain enough precision for intermediate steps.
Frequently asked questions
Which measurements should I use?
Match the exact vehicle variant before using a catalogue number; use several comparable refills for a personal budget.
Is the example a guaranteed result?
No. Driving conditions and the car’s condition affect the result. The numerical example names no actual model.
What should I check before acting?
Check the source date, market, grade and test cycle; reject lists that silently use one number for every year.
Use the result and related tools
Use the fuel-cost calculator with the measured average and today’s local price. The linked 600–1000cc comparison remains the separate source table; this guide explains how to choose and interpret its rows.
Sources and review scope
Reviewed 22 October 2026. The examples and arithmetic are original editorial illustrations, not field tests, certified designs, current price surveys or promised savings. Sources support the stated concepts; they do not certify these example inputs. The linked calculators have their own assumptions. These articles address specific decisions and complement the existing calculator guides. No Google search-volume or ranking claim is made.