Everyone wants to burn less fuel, but most advice out there amounts to theory with no real-world payoff. In our workshop we see cars that drink too much every single day, and the reasons are always the same. Here are the things that genuinely help, ranked by how big a difference they make.
Driving style is factor number one
This is free, and it gives the biggest return. Aggressive acceleration and harsh braking in the city can raise consumption by 20-30%. The point is not to drive slowly, but to drive smart.
Anticipation is key. When you see a red light 200 metres ahead, lift off the gas and use engine braking instead of stamping on the brake at the last moment. Every time you brake, you throw away energy you already paid for. Every launch from a standstill demands the most fuel.
Shift into a higher gear earlier. Most petrol engines run most efficiently between 1,500 and 2,500 RPM, and diesels between 1,200 and 2,000. If you routinely rev to 4,000 before shifting, you burn fuel for nothing.
On the open road, hold a steady speed. The gap between 120 and 140 km/h on the motorway costs 0.5 to 1 litre per 100 km, depending on the car. Over a longer trip that adds up fast.
Tire pressure and tire choice
The simplest thing you can do, yet the vast majority of drivers ignore it. Tires that are 0.5 bar below the recommended pressure raise consumption by 3-5%. The reason is straightforward: a larger contact patch means more rolling resistance.
Check pressure once a month, always on cold tires. The recommended value is on a sticker in the driver's door jamb, not on the tire sidewall. When you carry extra passengers or luggage, adjust according to the manufacturer's instructions.
The type of tire matters too. Winter tires in summer burn noticeably more than summer tires because of their softer compound and more aggressive tread. When the season is over, switch. If you are buying new tires, look at the rolling resistance rating on the EU label. The difference between class A and class E can mean up to 7-8% in fuel consumption.
Weight and aerodynamics
Everything the car carries takes energy. But a bigger issue than weight is aerodynamic drag, which grows with the square of speed.
Roof rails are a silent consumption killer. Even empty, they add 5-10% on the motorway purely from air resistance. Roof boxes are worse still. Remove them as soon as you are done.
Go through the boot. Spare gear, camping equipment sitting there since last summer, toolboxes you never use. Every unnecessary kilogram means more fuel, especially in stop-and-go city driving.
Maintenance that affects consumption
An engine in poor condition burns more, and it happens gradually, so the driver often does not notice.
A clogged air filter restricts airflow into the engine, and the ECU compensates with a richer mixture. The result is 5-10% higher consumption. Worn spark plugs fail to ignite the mixture fully, so part of the fuel exits unburned. Old oil increases internal friction.
Less obvious problems include brake calipers or pistons that drag slightly and create resistance, and misaligned wheels that pull the car to one side and wear tires unevenly. All of these show up during a regular service.
If you think your car is burning more than it used to and you cannot pinpoint why, read our guide on diagnosing increased fuel consumption.
Idling, short trips, and air conditioning
The engine burns the most fuel in the first few minutes after startup, while it is cold. The ECU injects a richer mixture until operating temperature is reached, and that is normal. But it means that short trips of 2-3 km have disproportionately high consumption because the engine never reaches its optimal temperature.
Warming up the engine at idle for 5-10 minutes before setting off makes no sense on modern engines. Start the engine, wait 15-20 seconds for oil to circulate, and drive gently. The engine warms up faster through light driving than through standing still.
As for air conditioning, the real impact depends on the situation. In the city, the AC can add 0.5-1 litre per 100 km. On the motorway the effect is smaller, and open windows at speed create drag that costs roughly as much as the AC. The rule is simple: on the motorway, use the AC; in slow city traffic, a window is more economical.
In winter, consumption rises for entirely different reasons unrelated to driving style. We have a separate guide on winter fuel consumption.
What does not work, no matter what anyone claims
The internet sells magnetic fuel-line devices, miracle additives that "improve combustion," and gadgets that supposedly cut consumption by 20-30%. None of it works. If it did, car manufacturers would have fitted it at the factory.
"Premium fuel reduces consumption in a standard engine" is a myth. If your engine is not designed for high-octane fuel, you gain nothing except a bigger bill at the pump.
"Driving in a lower gear saves fuel" is wrong. An engine at needlessly high RPMs burns more. Use the highest gear at which the engine runs without strain.
The only structural change that significantly lowers fuel costs is an LPG conversion. LPG does not reduce consumption in litres, but the price per litre is considerably lower, so total costs drop.
Real savings come from combining a few simple things: sensible driving, properly inflated tires, no unnecessary weight, and a car that is regularly serviced. Together, these changes can cut consumption by 15-25%.
If it is time for a service or you want us to check why your car is burning more than it should, book a basic service or get in touch directly.