5 ways to improve fuel efficiency in 2026
Fuel costs are an unavoidable part of car ownership. All drivers and car owners want to spend as little as possible on fuel. Covering the driving distances on their daily commute and the occasional weekend road trip, without paying more.
When historic fuel price adjustments push South African petrol and diesel prices to record levels, it matters. And all the clever in-car tech and infotainment syncing with your playlist matter a lot less than getting more mileage for every litre of petrol or diesel you’ve paid for to use in the fuel tank.
But how do your driving habits, wheel/tyre choices, and engine maintenance awareness influence fuel consumption? We’ve got a guide for you that explains the driving behaviours and technical features that can increase or decrease your vehicle’s fuel consumption. Giving you 5 ways to improve fuel efficiency.
Change Your Driving Style
More throttle, more fuel. It’s not a difficult concept to understand. If you drive with sudden accelerations and then need to brake heavily at junctions and red traffic lights, you aren’t very efficient.
The truth is that South Africa’s hectic highway and urban traffic make it very difficult to avoid the stop-start driving that is ruinous to fuel consumption.
You can improve your fuel efficiency by adjusting your driving according to what is happening on the road. For example, if you are approaching a red robot or a stop sign, there is no point in speeding up. Rather, reduce speed and approach slowly until you have to come to a stop, then proceed slowly and smoothly.
But what about coasting downhill? It doesn’t really save any fuel because your engine’s electronic control software knows it’s running on low load, and does everything possible to save fuel when driving downhill. Short-shifting in general driving isn’t always that healthy for your car’s engine, either. Too much driving at low engine speeds can increase cylinder pressure, which isn’t ideal for long term engine health.
With most of South Africa’s new cars being automatics, CVTs or dual-clutch transmissions, many drivers don’t have to worry about perfect gearshift patterns to increase efficiency. They just need to be gentle on the throttle. If you have stop-start functionality, use it in traffic.
Improve fuel efficiency by thinking aero
At highway cruising speeds, the most significant factor in fuel consumption is aerodynamic drag. The low-pressure zone around the rear of the car, is responsible for more than three-quarters of the fuel consumption.
Aerodynamic drag is a significant influence on your fuel economy, especially at higher speeds when travelling long distances. There isn’t much you can do to make your car more aerodynamic, but you can be cleverer about shape and spec to ensure you aren’t buying something that’s purposefully unaerodynamic.
Vehicles with a higher stance and boxier proportions have much more aerodynamic drag. That’s bakkies and SUVs. If you really don’t need the all-terrain ability of a high-stance SUV or double-cab bakkie, rather buy a crossover with a lower roofline and a slicker shape that has much less aerodynamic drag.
Also, if you have bicycle or roof racks, take them off when not in use, as they increase drag, which increases fuel consumption.
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Lose Weight
A vehicle loaded with unnecessary weight will use more fuel, so rather remove these items from your vehicle. If you have to transport goods, driving more slowly will reduce your fuel consumption.
As with aerodynamic considerations, weight is often a function of vehicle type. And it really makes a difference not buying more vehicle than you are going to use. If you don’t really need the structural strength of that heavy SUV or bakkie for towing or hardcore all-terrain adventure driving, you are carrying a lot of weight every driving moment, for no good reason.
Another weight issue to think of, is rotational weight. That’s the influence of unsprung weight, like your wheels and tyres. Those heavy-duty off road specification tyres might look great on your double cab bakkie or SUV. And work well on a road trip to Namibia, but they do increase rotational weight. And that will increase fuel consumption.
Tread and pressure
Tyres are the most important safety feature on your car. But they also significantly influence performance and economy.
Most drivers know that driving with the correct tyre pressures will deliver the best braking performance, handling, and the lowest tyre drag. Monitoring and keeping your tyre pressures in the ideal range ensures better tyre life and the lowest possible fuel consumption. And it is something that is easy to check and adjust.
But tyres also influence your fuel consumption in other ways. If you choose a high-performance driving tyre designed for optimal braking and cornering grip, it will have a stickier compound and more drag. That also means heavier fuel consumption.
Tyre tread patterns can also dramatically influence fuel consumption. As do tyre size and weight. SUV and double cab bakkie owners often upgrade to all-terrain tyres. These tyres are heavier (with reinforced casings) and feature deeper tread lugs for better grip in sand, rock, and muddy conditions.
Besides being heavier, all-terrain tyres also have more aggressive, deeper, tread patterns, which increase rolling resistance and fuel consumption on sealed surfaces like highways and urban roads. That humming sound you hear from a tyre on a double cab bakkie or SUV at highway speeds? That’s the sound signature of that deep groove tread pattern, literally increasing your fuel consumption.
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Improve fuel efficiency with engine health
Car maintenance is essential, and a well-maintained car will use less fuel over time. Make sure that your car is regularly serviced and change your oil and air filters with each service. Also, make sure you are using the correct fuel and oil grade for your car.
You know that oil is essential in your car and it can improve fuel efficiency in ways you might not think of. Remember, it’s not only for lubrication. Oil also serves as an additional cooling agent for your engine. And in a climate like South Africa, where engines are exposed to extreme heat for half of every year, oil works hard. Most modern engines have camshaft timing and phasing, which is hydraulically controlled and driven by the engine oil, adding even more work to all the tasks the oil needs to do.
You should check oil regularly. Especially if you tow a lot, drive your vehicle fully loaded often, or spend most of your days in stop-stop traffic.
Beyond oil, carbon capture also influences engine health and how close your car can operate to its designed efficiency. Modern cars have very advanced emissions controls. The engines have exhaust gas recirculation (EGR) systems and diesel particulate filters (DPFs) that work hard to capture carbon and chemically contain harmful emissions.
But those systems can clog with carbon build-up if you drive in traffic all the time. Why? Because they need to run at a specific predetermined operating temperature to burn off any excess carbon build-up. The issue is that your engine can only reach that operating temperature for the emissions control systems to clean carbon build-up at highway speeds while running at a constant cruising speed. And if the emission systems clog, engine performance degrades and fuel consumption increases.
If you drive daily stop-and-go traffic, a Sunday drive at constant speed on the highway has value. It allows your engine’s carbon-capture system to reach peak operating temperature and clean itself as it was engineered to do.