'Best to avoid': Drivers warned of car button which boosts fuel consumption by 20 percent


“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 vehicle.



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