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“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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