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The Oldest established rating system in North America makes the Mobil Travel Guide series a must have for travellers wanting up to date ratings on hotels and restaurants in a given locale. Combined with expert information on the surrounding sights and scenery. Mobil Corporation (now known as Exxon Mobil Corporation, following a 1999 merger) began producing the Mobil Travel Guide (MTG) following the introduction of the US Highway system in 1958. The first edition covered only five southwestern states. Since then, the Mobil Travel Guide has become the premier travel guide in North America, covering the 48 contiguous states and major cities in Canadian provinces.