In modern cars, when you press the gas pedal you aren’t actually directly opening and closing a throttle. Rather, your giving input to a computer to open and close a throttle. At the same time most modern cars in the US use automatic transmissions which shift gears based on multiple different inputs. All in all that computer is generally programmed to balance fuel efficiency against preformance. A sport mode changes that. Now your pedal press gives you more gas and the shifting pattern of the transmission changes. This gives you faster and more responsive acceleration, but it’s much harder on your fuel economy.
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