Cost per 100 km: Compare Fuel and Electric Driving

Cost per 100 km turns an efficiency figure into a spending estimate. Multiply consumption over 100 km by the relevant unit price, using the same measurement boundary throughout. The result describes energy spending for a scenario; it is not the full cost of owning a car.

Petrol and diesel calculation

If a car uses 7 litres per 100 km and the hypothetical fuel price is TRY 50 a litre, energy cost is 7 × 50 = TRY 350 per 100 km. Dividing by 100 gives TRY 3.50 per kilometre. At 1,200 km per month, the same scenario costs TRY 4,200.

These numbers illustrate the formula, not current pump prices or a measurement of a particular car. Replace both inputs with your own records. A dashboard's short-trip reading may not represent your usual mixture of city traffic, motorway driving and cold starts.

Electric vehicle calculation

For electricity, multiply kWh per 100 km by the price per kWh. The video uses 20 billed kWh per 100 km and a hypothetical TRY 8 per kWh: 20 × 8 = TRY 160 per 100 km, or TRY 1.60 per km. At 1,200 km, the energy bill is TRY 1,920.

The crucial question is where the energy is measured. Battery energy used while driving and electricity billed at a charger need not be the same quantity. Label your input before making the comparison. Mixing a battery-side figure with a wall-side figure can make one option look unfairly inexpensive.

Do not add charging losses twice

If 18 kWh must reach the battery and you assume 90% charging efficiency, purchased energy is 18 ÷ 0.90 = 20 kWh. At the video’s TRY 8 per kWh example price, that is TRY 160. The efficiency is an assumption for the example, not a universal vehicle specification.

If your input already comes from billed energy divided by distance, it already contains the losses captured by that measurement. Adding another loss allowance would count that effect twice. The charging cost guide explains this boundary with a battery charging example.

Mixed charging needs a weighted calculation

Suppose 70% of purchased energy costs TRY 4 per kWh and 30% costs TRY 12. The energy-weighted price is 0.70 × 4 + 0.30 × 12 = TRY 6.40 per kWh. At 20 purchased kWh per 100 km, cost becomes TRY 128.

Use energy shares, not an unweighted average of two prices. Two visits to a charger do not necessarily purchase equal quantities of electricity. Session fees, parking or time charges should be added separately where applicable.

Compare journeys on a consistent basis

Record distance, energy or fuel, temperature, route, speed pattern and load. Keep city and motorway scenarios separate if both matter. Compare repeated records rather than presenting one unusually favourable trip as a yearly average.

For a planning worksheet, create low, central and high consumption cases. Keep unit prices in their own cells so the calculation is easy to update. A higher price and a higher consumption figure can compound; changing only one may understate your expensive scenario.

What the result excludes

Purchase price, finance, insurance, maintenance, depreciation, taxes and charging equipment are outside an energy-only calculation. If the question is which car is cheaper to own, add those categories across the same period and distance. A low cost per 100 km does not automatically offset a higher purchase price.

You can check the arithmetic by first calculating one kilometre, then multiplying by 100, and finally calculating your expected monthly distance. If these methods disagree, inspect units and measurement boundaries before interpreting the result. All monetary inputs here are illustrative and should be replaced with applicable prices.

Sources and scope

• Official reference 1

Related videos

The linked videos use Turkish narration. This article provides the English explanation of the same topic and assumptions.

• Watch the companion video
• Watch companion video 2

Edited by GKN Labs. Editorial update: 4 November 2026. Cover and explanatory visuals are illustrative, not evidence of product testing or measurement.