求翻译：The Ecoboost rating is based on only one model year of data. The Toyota Sequoia has only a mediocre long-term reliability, although it has a notable 2011 reliability rating. The 2011 rating of the Traverse, Suburban, and XL are rather mediocre. It may be best to avoid this group entirely, unless the price of a luxury sport-utility vehicle is prohibitive or vehicular dimensions force a purchase.是什么意思？

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