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The petrol price is a common gripe amongst South Africans, and despite promises of a drop in price, it’s always useful to know your car’s fuel consumption. So how do you calculate it? There are two measures of fuel consumption – litres per 100km (l/100 km) and kilometre per litre (km/l). In this article, you will learn how to calculate both. Some of the newer, fancier cars are super smart, enabling you to get your consumption with the click of a few buttons on the steering wheel. Everyone else will need some basic arithmetic. Set your starting point. The next time you go to the petrol station, ask the petrol attendant to fill up to auto-stop. The reason you ask for auto-stop is to set a defined level. Reset your car’s trip/distance counter to 0. After you leave the petrol station, drive as you would usually do. Just don’t reset your trip/distance counter. When refueling, ask the petrol attendant to fill up to auto stop again. Check the petrol pump to see how many litres went in. Check your trip/distance counter and note the kilometre reading. You now have the two pieces of information you need to determine your fuel consumption – the number of litres used (from the petrol pump reading) and the number of kilometres you travelled (from your car’s trip/distance metre). For example, let’s say your car used 18.5 litres and travelled 254km. Litres per 100km Take the litres used, divide it by the distance travelled and multiply it by 100. Fuel consumption = (18.5/254) x 100 = 7.28 litres per 100km. This means your car uses 7.28 litres to drive 100km. You can also calculate the cost of fuel to drive 100km. In this example, at an inland petrol price of R21.40/litre, it would cost you R155.79 to drive 100km. Kilometre per litre Take the distance travelled and divide it by the litres used. This means that one litre of petrol enables your car to drive 13.73km. As a cost-saving exercise, why not make a game of it? Drive as fuel efficiently as possible (eg. cruising at a constant speed on the highway and no speeding towards red traffic lights) and see how low you can get your consumption. A nice side effect fuel-efficient driving is more money in your wallet each month. Wealthy Maths blog Our friend Stealthy Wealth knows his way around maths. Luckily for us he also speaks human, which is why we asked him to explain the most important maths we need to know to be good at money. This is not your average maths class. Tune in once a month and turn into a money mathemagician. 9 April 2026 How is your ETF doing in 2026? 8 April 2026 SA Retail Stocks: Where the Value Is Right Now 5 April 2026 Your Chat Bot Has a Sponsor 2 April 2026 An Actively Managed AI Focused ETF Lists on the JSE
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[JSE Direct podcast](https://justonelap.com/podcast-jsedirect/) - [Retire blog](https://justonelap.com/retire-blog/) - [Trade](https://justonelap.com/trade/ "Learn how to trade") - [Learn trading](https://justonelap.com/learn/) - [Improve trading](https://justonelap.com/improve/) - [Village Trader](https://justonelap.com/village-trader/) - [Trading Boot Camp](https://justonelap.com/trading-boot-camp/) - [Trading Master Class](https://justonelap.com/trading-master-class/) - [CFD Conversations](https://justonelap.com/cfd-conversations/) - [Power Hour](https://justonelap.com/power-hour/) - [ETF Database](https://justonelap.com/etfdatabase/) - [About](https://justonelap.com/about/) - [Sponsors](https://justonelap.com/sponsors/) - [Contact](https://justonelap.com/contact/ "Get in touch with us") - [Search](https://justonelap.com/wealthy-maths-how-to-calculate-fuel-consumption/) # Wealthy Maths: How to calculate fuel consumption Stealthy Wealth15 May 2025[Latest](https://justonelap.com/latest/ "View all posts in: “Latest\”"), [Wealthy Maths](https://justonelap.com/wealthymaths/ "View all posts in: “Wealthy Maths\”") ![a red car in a shopping trolley](https://i0.wp.com/justonelap.com/wp-content/uploads/2022/09/buying_car.jpg?resize=300%2C188&ssl=1)The petrol price is a common gripe amongst South Africans, and despite promises of a drop in price, it’s always useful to know your car’s fuel consumption. So how do you calculate it? There are two measures of fuel consumption – litres per 100km (l/100 km) and kilometre per litre (km/l). In this article, you will learn how to calculate both. Some of the newer, fancier cars are super smart, enabling you to get your consumption with the click of a few buttons on the steering wheel. Everyone else will need some basic arithmetic. 1. Set your starting point. The next time you go to the petrol station, ask the petrol attendant to fill up to auto-stop. The reason you ask for auto-stop is to set a defined level. Reset your car’s trip/distance counter to 0. 2. After you leave the petrol station, drive as you would usually do. Just don’t reset your trip/distance counter. 3. When refueling, ask the petrol attendant to fill up to auto stop again. Check the petrol pump to see how many litres went in. Check your trip/distance counter and note the kilometre reading. You now have the two pieces of information you need to determine your fuel consumption – the number of litres used (from the petrol pump reading) and the number of kilometres you travelled (from your car’s trip/distance metre). For example, let’s say your car used 18.5 litres and travelled 254km. ##### **Litres per 100km** Take the litres used, divide it by the distance travelled and multiply it by 100. ![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/10/Fuel-consumption1.png?resize=300%2C52&ssl=1) Fuel consumption = (18.5/254) x 100 = 7.28 litres per 100km. This means your car uses 7.28 litres to drive 100km. You can also calculate the cost of fuel to drive 100km. In this example, at an inland petrol price of R21.40/litre, it would cost you R155.79 to drive 100km. ##### **Kilometre per litre** Take the distance travelled and divide it by the litres used. ![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/10/Fuel-consumption2.png?resize=300%2C59&ssl=1)![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/10/Fuel-consumption2.png?resize=300%2C59&ssl=1) This means that one litre of petrol enables your car to drive 13.73km. As a cost-saving exercise, why not make a game of it? Drive as fuel efficiently as possible (eg. cruising at a constant speed on the highway and no speeding towards red traffic lights) and see how low you can get your consumption. A nice side effect fuel-efficient driving is more money in your wallet each month. *** [Wealthy Maths blog](https://justonelap.com/wealthy-maths-blog/) ![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/08/weathymathslight-1.png?resize=150%2C150&ssl=1)![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/08/weathymathslight-1.png?resize=150%2C150&ssl=1)Our friend [Stealthy Wealth](http://www.stealthywealth.co.za/) knows his way around maths. Luckily for us he also speaks human, which is why we asked him to explain the most important maths we need to know to be good at money. This is not your average maths class. Tune in once a month and turn into a money mathemagician. *** [![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/04/Gemini_ETF_YTD_08Apr26.png?fit=150%2C150&ssl=1)![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/04/Gemini_ETF_YTD_08Apr26.png?fit=150%2C150&ssl=1)](https://justonelap.com/how-is-your-etf-doing-in-2026/ "How is your ETF doing in 2026?") [How is your ETF doing in 2026?](https://justonelap.com/how-is-your-etf-doing-in-2026/ "How is your ETF doing in 2026?") 9 April 2026 How is your ETF doing in 2026? [![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/04/wwm_673.jpg?fit=150%2C84&ssl=1)](https://justonelap.com/podcast-sa-retail-stocks-where-the-value-is-right-now/ "SA Retail Stocks: Where the Value Is Right Now") [SA Retail Stocks: Where the Value Is Right Now](https://justonelap.com/podcast-sa-retail-stocks-where-the-value-is-right-now/ "SA Retail Stocks: Where the Value Is Right Now") 8 April 2026 SA Retail Stocks: Where the Value Is Right Now [![AI in the Wild \| Your Chat Bot Has a Sponsor](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/03/Gemini_AIW_Ads_Apr26.png?fit=150%2C150&ssl=1)![AI in the Wild \| Your Chat Bot Has a Sponsor](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/03/Gemini_AIW_Ads_Apr26.png?fit=150%2C150&ssl=1)](https://justonelap.com/your-chat-bot-has-a-sponsor/ "Your Chat Bot Has a Sponsor") [Your Chat Bot Has a Sponsor](https://justonelap.com/your-chat-bot-has-a-sponsor/ "Your Chat Bot Has a Sponsor") 5 April 2026 Your Chat Bot Has a Sponsor [![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/03/Gemini_IVYAI.png?fit=150%2C150&ssl=1)![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/03/Gemini_IVYAI.png?fit=150%2C150&ssl=1)](https://justonelap.com/an-actively-managed-ai-focused-etf-lists-on-the-jse/ "An Actively Managed AI Focused ETF Lists on the JSE") [An Actively Managed AI Focused ETF Lists on the JSE](https://justonelap.com/an-actively-managed-ai-focused-etf-lists-on-the-jse/ "An Actively Managed AI Focused ETF Lists on the JSE") 2 April 2026 An Actively Managed AI Focused ETF Lists on the JSE [How is your ETF doing in 2026? 9 April 2026](https://justonelap.com/how-is-your-etf-doing-in-2026/ "Permalink to: \"How is your ETF doing in 2026?\"") [SA Retail Stocks: Where the Value Is Right Now 8 April 2026](https://justonelap.com/podcast-sa-retail-stocks-where-the-value-is-right-now/ "Permalink to: \"SA Retail Stocks: Where the Value Is Right Now\"") [Your Chat Bot Has a Sponsor 5 April 2026](https://justonelap.com/your-chat-bot-has-a-sponsor/ "Permalink to: \"Your Chat Bot Has a Sponsor\"") [An Actively Managed AI Focused ETF Lists on the JSE 2 April 2026](https://justonelap.com/an-actively-managed-ai-focused-etf-lists-on-the-jse/ "Permalink to: \"An Actively Managed AI Focused ETF Lists on the JSE\"") ##### Events [![](https://i0.wp.com/justonelap.com/wp-content/uploads/2025/08/ETFDB_Aug25.png?fit=1024%2C1024&ssl=1)](https://justonelap.com/etfdatabase/) #### Popular Posts - [![How is your ETF doing in 2026?](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/04/Gemini_ETF_YTD_08Apr26.png?fit=1024%2C1024&ssl=1&resize=40%2C40)![How is your ETF doing in 2026?](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/04/Gemini_ETF_YTD_08Apr26.png?fit=1024%2C1024&ssl=1&resize=40%2C40)](https://justonelap.com/how-is-your-etf-doing-in-2026/ "How is your ETF doing in 2026?") 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Readable Markdown
![a red car in a shopping trolley](https://i0.wp.com/justonelap.com/wp-content/uploads/2022/09/buying_car.jpg?resize=300%2C188&ssl=1)The petrol price is a common gripe amongst South Africans, and despite promises of a drop in price, it’s always useful to know your car’s fuel consumption. So how do you calculate it? There are two measures of fuel consumption – litres per 100km (l/100 km) and kilometre per litre (km/l). In this article, you will learn how to calculate both. Some of the newer, fancier cars are super smart, enabling you to get your consumption with the click of a few buttons on the steering wheel. Everyone else will need some basic arithmetic. 1. Set your starting point. The next time you go to the petrol station, ask the petrol attendant to fill up to auto-stop. The reason you ask for auto-stop is to set a defined level. Reset your car’s trip/distance counter to 0. 2. After you leave the petrol station, drive as you would usually do. Just don’t reset your trip/distance counter. 3. When refueling, ask the petrol attendant to fill up to auto stop again. Check the petrol pump to see how many litres went in. Check your trip/distance counter and note the kilometre reading. You now have the two pieces of information you need to determine your fuel consumption – the number of litres used (from the petrol pump reading) and the number of kilometres you travelled (from your car’s trip/distance metre). For example, let’s say your car used 18.5 litres and travelled 254km. ##### **Litres per 100km** Take the litres used, divide it by the distance travelled and multiply it by 100. ![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/10/Fuel-consumption1.png?resize=300%2C52&ssl=1) Fuel consumption = (18.5/254) x 100 = 7.28 litres per 100km. This means your car uses 7.28 litres to drive 100km. You can also calculate the cost of fuel to drive 100km. In this example, at an inland petrol price of R21.40/litre, it would cost you R155.79 to drive 100km. ##### **Kilometre per litre** Take the distance travelled and divide it by the litres used. ![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/10/Fuel-consumption2.png?resize=300%2C59&ssl=1) This means that one litre of petrol enables your car to drive 13.73km. As a cost-saving exercise, why not make a game of it? Drive as fuel efficiently as possible (eg. cruising at a constant speed on the highway and no speeding towards red traffic lights) and see how low you can get your consumption. A nice side effect fuel-efficient driving is more money in your wallet each month. *** [Wealthy Maths blog](https://justonelap.com/wealthy-maths-blog/) ![](https://i0.wp.com/justonelap.com/wp-content/uploads/2018/08/weathymathslight-1.png?resize=150%2C150&ssl=1)Our friend [Stealthy Wealth](http://www.stealthywealth.co.za/) knows his way around maths. Luckily for us he also speaks human, which is why we asked him to explain the most important maths we need to know to be good at money. This is not your average maths class. Tune in once a month and turn into a money mathemagician. *** [![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/04/Gemini_ETF_YTD_08Apr26.png?fit=150%2C150&ssl=1)](https://justonelap.com/how-is-your-etf-doing-in-2026/ "How is your ETF doing in 2026?") 9 April 2026 How is your ETF doing in 2026? [![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/04/wwm_673.jpg?fit=150%2C84&ssl=1)](https://justonelap.com/podcast-sa-retail-stocks-where-the-value-is-right-now/ "SA Retail Stocks: Where the Value Is Right Now") 8 April 2026 SA Retail Stocks: Where the Value Is Right Now [![AI in the Wild \| Your Chat Bot Has a Sponsor](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/03/Gemini_AIW_Ads_Apr26.png?fit=150%2C150&ssl=1)](https://justonelap.com/your-chat-bot-has-a-sponsor/ "Your Chat Bot Has a Sponsor") 5 April 2026 Your Chat Bot Has a Sponsor [![](https://i0.wp.com/justonelap.com/wp-content/uploads/2026/03/Gemini_IVYAI.png?fit=150%2C150&ssl=1)](https://justonelap.com/an-actively-managed-ai-focused-etf-lists-on-the-jse/ "An Actively Managed AI Focused ETF Lists on the JSE") 2 April 2026 An Actively Managed AI Focused ETF Lists on the JSE
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