1. Drive at a Consistent, Lower Speed
Speed is the single biggest driver of fuel consumption. Aerodynamic drag increases with the square of speed — driving at 110 km/h uses roughly 25–30% more fuel than driving at 90 km/h. Slowing from 110 to 100 km/h on a highway commute can reduce fuel use by 10–15%.
Estimated saving: 8–15% on highway commutes
2. Reduce Unnecessary Idling
A modern petrol engine uses roughly 0.6–1.0 L per hour when idling. If your commute involves 15 minutes of stop-start traffic daily, that is 3–5 litres per week wasted while stationary. Modern engines do not need to warm up — drive gently from start and avoid extended idling wherever possible.
Estimated saving: 2–5%
3. Maintain Correct Tyre Pressure
Under-inflated tyres increase rolling resistance and fuel consumption. A tyre 10 PSI under-inflated increases fuel use by roughly 1–3%. Tyre pressure drops about 1 PSI per 5°C temperature drop — check monthly when tyres are cold. The recommended pressure is on a sticker inside your driver's door jamb.
Estimated saving: 1–3%
4. Accelerate Smoothly and Anticipate Stops
Aggressive acceleration followed by hard braking converts fuel into heat via the brakes — wasting both. Smooth acceleration and coasting to decelerate keeps kinetic energy in the vehicle. Studies suggest eco-driving habits can reduce fuel use by 10–20% with no vehicle changes, with the largest effect in stop-start urban conditions.
Estimated saving: 5–20%
5. Carpool or Rideshare
Carpooling is the most effective way to cut commute costs — because you split them. A $15/day commute becomes $7.50 with two people sharing. Use our carpool fuel split calculator to work out a fair cost-sharing arrangement.
Estimated saving: 25–75% depending on arrangement
6. Optimise Your Route
Shorter is not always cheaper. A route with fewer stops and more consistent speeds often uses less fuel than a shorter congested route. Working from home even one day per week reduces your weekly commute by 20% — equivalent to a 20% fuel cost reduction with no other changes.
Estimated saving: 5–20% with route changes and WFH flexibility
7. Consider a More Fuel-Efficient Vehicle
If your vehicle averages 12+ L/100km, upgrading to a modern vehicle at 7 L/100km could save 40%+ on fuel — over $1,000 annually on a typical commute. Hybrid vehicles are particularly well-suited to commuting because they recover energy during braking — exactly the pattern that makes urban commuting expensive for conventional vehicles. Use our EV vs gas calculator to model whether the savings justify the upfront cost difference.
Estimated saving: 20–60%+ depending on current vs new vehicle
How Much Can You Save?
Using a 40 km round-trip commute, 5 days per week, 48 working weeks per year, in a car using 9 L/100km at $1.90/L (annual spend ~$2,750):
- Smooth driving habits alone: save $275–$550 (10–20%)
- Carpool 2 days per week: save ~$550 (20%)
- Work from home 1 day per week: save ~$550 (20%)
- Combined strategies: save $1,375–$1,650 per year (50–60%)