Why is 'skip shifting,' or moving directly from a lower gear to a gear two steps higher, sometimes used on level roads?

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1. It can reduce unnecessary shifting when there is more than enough power for the load and grade
2. It works only on a completely flat road with no upcoming turns, which sounds right but isn't, at least for roads
3. It is required by federal regulation on every level roadway
4. It always improves fuel economy regardless of load

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