Detailed analysis of how tire maintenance and driving style directly impact fuel consumption on long journeys
Planning a vacation involves several costs, and fuel represents a significant portion of the budget. For drivers looking to optimize the efficiency of their vehicles, understanding how correct tire inflation and driving can save fuel is essential. These two factors, often underestimated, have a direct and measurable impact on engine performance and, consequently, consumption. This guide details the technical principles behind this savings and offers a practical roadmap for applying this knowledge on your next trip.
Tire inflation: the foundation of efficiency
Tire pressure is one of the most critical parameters for the safety and efficiency of a vehicle. Correct calibration, specified by the manufacturer, ensures that the tread has ideal contact with the ground, optimizing grip, stability and, crucially, rolling resistance.
Rolling resistance is the force that opposes the tire’s movement on a surface. Tires with pressure below the recommended amount deform more, increasing the contact area with the asphalt and, consequently, the energy required to move them. The engine needs to work harder to overcome this extra force, resulting in a direct increase in fuel consumption.
- Where to find the correct pressure: The ideal inflation information (measured in PSI or bar) is not on the tire, but in the owner’s manual or on an adhesive label located on the driver’s door pillar, on the inside of the fuel tank lid or in the glove compartment.
- Variation with load: Manufacturers generally specify different pressures for the vehicle with little load (driver only) and with maximum load (passengers and luggage). For holiday trips, it is essential to use the maximum load specification.
- When to calibrate: Pressure measurement and adjustment must be done with cold tires, that is, having driven a maximum of 3 km at low speed. Hot tires have higher pressure, which can lead to incorrect inflation.
Driving techniques for maximum fuel economy
Driving style, also known as defensive or economical driving, is the second pillar of efficiency. The way the driver interacts with the accelerator, brake and gearbox directly influences the load imposed on the engine and the amount of fuel injected.
- Smooth acceleration and braking: Avoid sudden accelerations and last-minute braking. Accelerating progressively requires less from the engine. Likewise, anticipating stops (traffic lights, traffic) and gradually reducing speed, taking advantage of the vehicle’s inertia, is more efficient than braking suddenly.
- Maintain constant speed: Speed fluctuations are enemies of the economy. On highways, use cruise control to maintain a constant and stable speed, which optimizes engine operation in its most efficient rpm range.
- Take advantage of the “cut-off”: Cars with electronic injection have a system called cut-off, which cuts the fuel supply when the driver takes his foot off the accelerator with a gear engaged and the vehicle is moving (engine braking). When going downhill, for example, use this technique instead of leaving the car in neutral (“toothless”), a practice that, in addition to being dangerous, consumes fuel to keep the engine at idle.
- Reduce aerodynamic drag: At highway speeds (above 80 km/h), aerodynamic drag becomes a significant factor in consumption.
- Keep the windows closed and use the ventilation or air conditioning system.
- Remove roof racks and other external accessories when not in use, as they disrupt airflow and increase drag.
Additional factors that impact travel consumption
In addition to calibration and driving style, other elements can affect the vehicle’s efficiency during a long trip. Attention to these details complements core practices and maximizes fuel savings.
- Vehicle weight: Every 50 kg of extra weight can increase fuel consumption by up to 2%. Avoid carrying unnecessary cargo. Distribute luggage evenly in the trunk.
- Air conditioning use: The air conditioning compressor is driven by the engine, which increases fuel consumption. Its impact is most notable in urban traffic. On highways, the increase in aerodynamic drag with the windows open can consume more than the air conditioning on. The recommendation is to use it moderately.
- Vehicle maintenance: A car with up-to-date maintenance is more efficient. Items such as spark plugs, air and fuel filters, and the quality of engine oil directly impact fuel burn and overall performance.
- Alignment and balancing: Misaligned or unbalanced wheels increase the friction of the tires with the ground, generating irregular wear and greater rolling resistance, which increases consumption.
By combining preventive maintenance, focusing on correct tire inflation for the load condition of the trip, with the adoption of a smooth and planned driving style, it is possible to achieve a significant reduction in fuel consumption. These practices not only ease the vacation budget, but also increase safety on the road and contribute to the longevity of the vehicle’s mechanical components.
