Fuel Consumption: How to Reduce It and What Affects It

Fuel Consumption in European Context

Fuel costs in Europe are among the highest in the world, making fuel consumption a critical factor in vehicle ownership. Unlike the US where fuel is relatively cheap, European drivers feel every extra litre keenly. Understanding what drives consumption — and how to minimise it — is essential for keeping motoring costs manageable.

Buying a used vehicle? Always check the VIN first. Mechanical issues that increase fuel consumption may not be immediately obvious.

Understanding the Numbers

Europe measures fuel consumption in litres per 100 kilometres (L/100km). A lower number is better — a car that uses five litres per hundred kilometres is more efficient than one that uses eight. The WLTP (Worldwide Harmonised Light Vehicle Test Procedure) provides official consumption figures for new vehicles. As with any standardised test, real-world consumption is typically higher — often by fifteen to twenty-five percent.

WLTP categories: Low (urban, stop-and-go), Medium (suburban), High (rural/B-road), Extra High (motorway), and Combined (weighted average).

What Affects Fuel Consumption

Engine and Powertrain

Diesel vs Petrol. Diesel engines are inherently more fuel-efficient than petrol engines — typically using fifteen to twenty-five percent less fuel for the same distance. However, diesel fuel may cost more per litre in some countries, and diesel engines have higher purchase prices and potentially expensive maintenance (DPF, AdBlue systems).

Engine size and technology. Modern downsized turbocharged engines (common in Europe — 1.0 to 1.5 litre turbo petrol, 1.5 to 2.0 litre turbo diesel) offer excellent efficiency. Naturally-aspirated engines of the same power output typically consume more fuel.

Hybrid powertrains. Mild hybrids, full hybrids, and plug-in hybrids all improve fuel efficiency. Full hybrids excel in urban driving where regenerative braking captures energy that would otherwise be lost. Plug-in hybrids can offer very low consumption if regularly charged and used for short commutes on electric power.

Transmission. Modern dual-clutch gearboxes (DCT) and torque converter automatics with many ratios are efficient. CVTs are efficient but less common in Europe. Manual gearboxes remain efficient when driven properly.

Vehicle Factors

Weight. European cars tend to be lighter than their American counterparts, which helps efficiency. But within the European market, the trend toward heavier SUVs and crossovers is increasing average consumption.

Aerodynamics. European motorway speeds (often 120-130 km/h, unlimited on parts of the German Autobahn) mean aerodynamic drag is a major factor. Roof boxes, bicycle racks, and even open windows significantly increase consumption at these speeds.

Tyres. The EU tyre label includes a fuel efficiency rating from A (best) to E (worst). Choosing A-rated tyres can measurably improve consumption. Tyre pressure is equally important — check it regularly.

Driving Conditions

Urban vs Motorway. City driving with frequent stops and starts consumes more fuel per kilometre than steady motorway cruising. However, at very high motorway speeds (above 130 km/h), consumption rises sharply due to aerodynamic drag.

Climate. Cold European winters increase consumption through engine warm-up time, heavier oil viscosity, denser cold air, and heating demands. Summer air conditioning also increases consumption, though less dramatically.

Terrain. Europe's varied terrain — Alpine passes, Scandinavian hills, rolling British countryside — affects consumption. Hilly terrain requires more fuel than flat Netherlands-style driving.

How to Reduce Consumption

Eco-Driving Techniques

Anticipation. The cornerstone of European eco-driving. Look far ahead, anticipate traffic flow, and avoid unnecessary braking and acceleration. Smooth driving saves fuel and reduces brake wear.

Optimal speed. The sweet spot for most cars is between eighty and one hundred kilometres per hour. At one hundred and thirty, consumption can be thirty to forty percent higher than at ninety. On the Autobahn, the fuel cost of driving at one hundred and sixty versus one hundred and twenty is enormous.

Gear selection. On manual gearboxes (still common in Europe), shift up early — around two thousand RPM for petrol, fifteen hundred for diesel. Stay in the highest gear possible without labouring the engine. Many modern automatics have an eco mode that does this automatically.

Engine braking. Lift off the accelerator early when approaching junctions, roundabouts, or slower traffic. Modern fuel injection systems cut fuel supply entirely during engine braking — you are literally using zero fuel while decelerating in gear.

Start-stop. If your vehicle has start-stop technology, let it work. It saves fuel in urban driving. If your vehicle does not have it, consider switching off the engine manually when stopped for more than about thirty seconds.

Maintenance

• Tyre pressure — check monthly when cold; under-inflation increases rolling resistance significantly
• Air filter — replace on schedule; a restricted filter wastes fuel
• Engine oil — use the manufacturer-recommended specification; lower viscosity oils reduce friction
• Fuel system — clean injectors and a functioning oxygen sensor ensure optimal combustion
• Service intervals — keeping to the manufacturer's schedule maintains efficiency

Vehicle Setup

• Remove roof racks, boxes, and carriers when not in use — even an empty rack increases drag
• Clear unnecessary weight from the boot
• Use air conditioning judiciously — it adds measurably to consumption in city driving
• Close windows at motorway speeds — the drag costs more fuel than running the AC

Diesel, Petrol, or Hybrid?

Diesel makes most sense for high-mileage drivers who cover significant motorway distances. The lower consumption offsets the higher purchase price and fuel cost per litre. Be aware of increasing low-emission zone restrictions on older diesels.

Petrol is simpler and cheaper to maintain, and better suited for short trips and urban driving where DPF issues can plague diesels. Modern small-displacement turbocharged petrol engines are impressively efficient.

Hybrid offers the best urban economy (especially full hybrids) and is future-proof as emission regulations tighten. Plug-in hybrids are ideal if you can charge regularly and have a short commute.

Electric eliminates fuel consumption entirely but requires charging infrastructure and has higher upfront costs.

Fuel Consumption When Buying Used

Real-world consumption figures from owner forums and review sites are more accurate than manufacturer claims. When evaluating a used car, consider the specific engine and transmission combination (these vary within the same model), the vehicle's condition (worn engines consume more), driving patterns that match yours, and fuel costs in your country (diesel is not always cheaper).

Our reliable used car guide includes fuel-efficient picks. And proper tyres make a measurable difference.

Browse vehicles on Tuble.net. Calculate trip costs with our fuel cost calculator.