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The Dual VVT-i engine Toyota Corolla is designed to offer exceptional fuel economy, a priority for most Corolla drivers. Dual VVT-i (Variable Valve Timing with intelligence) adjusts the timing of both intake and exhaust valves, enhancing the combustion process to maximize fuel efficiency. When driving conditions change, the Dual VVT-i system adapts the valve timing to optimize fuel burn, ensuring that fuel is used most efficiently.