Drivers who drive 50mph in car warned 'never' open window or sunroof

Drivers have been urged to follow one of the "most effective" methods to improve economy over 50mph. The company suggested that drivers can significantly improve their fuel economy with one change as the summer getaway season begins.

A spokesperson for LKQ Euro Car Parts suggested that drivers travelling on high speed roads, such as motorways, should make sure all windows are up to make their vehicle more aerodynamic. They advised: "In summer months, it's tempting to roll down the car window for some fresh air and cool breeze.

"When you're driving at high speeds, however, keeping your windows or sunroof open can create resistance, meaning the engine will need to work harder to counteract the drag, resulting in increased fuel consumption. Because of this, keeping your windows closed is one of the most effective ways to improve fuel efficiency, especially when travelling above 50mph."

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PTA Garages Services also had a warning for people who are using air conditioning. They said: "Travelling at speeds of 50mph or less - in this instance, it's more economical to open your windows. This is because running the air conditioning at this low engine speed creates an extra demand, so therefore opening windows is the best option."

On Quora, a driver asked: "Why can't you keep the windows down on the highway?"A motorist replied: "You can, but at highway speeds, you'll get a lot of noise, and it will most likely hurt your gas mileage (drag created exceeds the parasitic drain from ac somewhere around 50-60 mph). There is also a chance of getting brained by a weaponized insect."

"You certainly can if you want to. many people prefer not to, due to several factors. You may have a reduction in gas mileage due to wind drag, and you or your passengers may be uncomfortable with excessive airflow and noise. Open windows tend to allow more dust, dirt and other airborne particles into the cabin as well. I noticed my last vehicle had significant staining on the headliner and pillar behind the constantly open driver’s window. Believe it or not, I was once driving on the highway with my left arm on the window sill and ran into a bee or wasp which stung me on the inner side of my elbow. I’m sure it’s not a real likely scenario, but I know from experience that it can happen. But the choice really is yours, and driving with the windows down can be quite enjoyable in the right weather," a second said.