Choose a moderate motorway speed
Why this can help
At higher road speeds, aerodynamic resistance increases the energy needed to travel. A suitable lower speed can reduce consumption on the same motorway journey.
One possible next step
Choose a safe, lawful cruising speed before the trip and compare consumption only on comparable journeys.
What changes the outcome
Always respect speed limits, minimum speeds and traffic conditions. Savings vary by vehicle and speed; a petrol-car percentage is not a universal factor for electric vehicles.
Your illustrative scenario
Over one year · with the assumptions below
You
25 litres of fuel used less
You + 10 friends
275 litres of fuel used less
1,000 participants
25,000 litres of fuel used less
These are scenarios, not measured personal or collective savings. One separate vehicle per participant. A shared car is counted once.
Your inputs
- Fuel per 100 km Before
- 7 L fuel
- Fuel per 100 km After
- 6.5 L fuel
- Comparable distance per year
- 5,000 km
Calculation of the difference: (7 − 6.5) × 5000 × 0.01 = 25 litres of fuel used
Calculation boundaries
Use the same vehicle, fuel, distance and comparable traffic, weather and load. A difference between unmatched trips cannot be attributed to this action. Do not add several driving improvements for the same fuel reduction. Always respect speed limits, minimum speeds and traffic conditions. Savings vary by vehicle and speed; a petrol-car percentage is not a universal factor for electric vehicles.
The initial values are editable arithmetic examples, not measurements or typical savings from the cited studies. Replace them with comparable readings for your situation. The sources support the mechanism and its conditions; they do not predict these numbers.
Sources and calculation references
- DOE/EPA — Driving more efficientlyUnited States Department of Energy/United States Environmental Protection Agency
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