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Big engine ( > 1.0 L) and gearbox is not optimized for going (slow).
For example 2.0L I4 might be utilized better running only with 2 cylinders if cylinders were utilized normally in pairs. Sure this would need run unused cylinders valves open and separated exhaust system.
Bore is oversized to be effective.
Same problem lies in mini sized engines trying get fast. Bore size is too small and speed is achieved through high rpm.
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