Car Air Conditioning vs. Windows Down: Which is More Fuel Efficient for Brisbane Drivers?
Brisbane motorists often wonder: is it more fuel-efficient to drive with the windows up and the car air conditioning on, or with the windows down? According to a study by the Society of Automotive Engineers (SAE), using your car’s air conditioning is often the more fuel-efficient option, especially at higher speeds.
SAE Study: Car Air Conditioning and Fuel Efficiency
The SAE study, conducted with General Motors, used both wind tunnel testing and desert track trials to simulate real-world driving conditions, including Brisbane’s climate. Two vehicles were tested: a full-size SUV with an 8.1-liter V8 engine and a full-size sedan with a 4.6-liter V8 engine.
Key Findings:
- Driving with windows down significantly reduced fuel efficiency—by 20% in sedans and 8% in SUVs—due to increased aerodynamic drag.
- Using the air conditioner only reduced fuel efficiency by about 10%, making it less impactful than driving with windows open.
- At speeds above 90 km/h (typical on Brisbane highways), open windows can decrease fuel efficiency by 20% or more.
- The more aerodynamic your car, the greater the negative impact of driving with windows down.
Brisbane Car Air Conditioning Tips for Fuel Economy
- For highway driving in Brisbane, keep your car windows up and use air conditioning for better fuel efficiency.
- Around town at lower speeds, the difference is less pronounced, but air conditioning remains a comfortable and efficient choice in hot Brisbane weather.
- Regular car air conditioning servicing ensures your system runs efficiently, helping you save fuel and stay comfortable year-round.
If you’re in Brisbane and want more tips, or need expert car air conditioning service, explore our site for facts, guides, and trusted local servicing options.