Drivers have been urged to avoid pressing one button on their cars if they want to maximise fuel efficiency.
As Ireland prepares to sizzle in the latest heatwave motorists have been warned to be cautious when using air conditioning or having their windows open as they could be guzzling their fuel.
With fuel prices still high and temperatures expected to rise further, many will be looking to keep cool without suffering the cost of added fuel.
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While the RAC says prices should fall, driving in the warm weather can be rather expensive.
When driving in warm weather, motorists will usually opt for having the windows open or use air conditioning.
But what many motorists may not know is that both options have a huge impact on how the fuel is used.
Air conditioning is very energy intensive, while open windows can reduce the drag of the car, making the car work harder and burn through the fuel quicker.
While both can be used, there are points at which one or the other is more beneficial to the driver and the car.
Chris Evans, head of content at Leasing.com, highlighted the benefits of using both air conditioning and having the windows open, reports Express.
He referenced a 2004 study by the Society of Automotive Engineers (SAE), which looked at the impact of windows open against air conditioning in larger saloons and SUVs.
In the study, there were plenty of variables including how much the windows were open, the aerodynamics of the different cars and how long someone might use the air conditioning.
He said: As such, the 45mph (70kmph) figure is a guide, but a fairly good one.
“While all this might seem like a minor issue, getting it wrong can have a notable impact on your fuel economy.
“Using AC can increase your fuel consumption by as much as 10 percent but opening the windows at higher speeds can increase fuel consumption by as much as 20 percent.”
A number of other studies have also followed, one of which found that hybrid car fuel economy is harder hit by air con use than conventional combustion-only cars.
More research, from Emissions Analytics, found that the impact of air conditioning on hybrid fuel economy was almost twice as much.
Fuel efficiency dropped 6.1 percent in a hybrid car on average, compared to just 3.8 percent for standard petrol car and 4.6 percent for a diesel.
Mr Evans continued saying: “While the 45mph (70kmph) line is a good guide, things get a bit more complicated when you are in bumper-to-bumper traffic.
“In these situations, it is probably best to avoid using air con or opening your windows.
“The air con merely recycles the cabin air rather than drawing the air from outside, where there is nose-to-tail line of traffic all belching out exhaust fumes.”
Other options for keeping the car cooler and not relying on air conditioning include parking in the shade or in a garage.
Tinted windows could also provide benefits for drivers, as will heat deflectors.
A car window tint can effectively reduce the heat given off by direct sunlight by as much as 70 percent inside a car.
Since the car will be cooler, drivers may be less likely to use the AC.
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