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The Postal Service spent $3.2 billion on highway transportation, an increase of 5.3 percent attributed to mail volume shifting from air to surface transportation. About 34.8 million additional miles of highway transportation were contracted. The price of diesel fuel, which comprises 93 percent of fuel purchased, rose almost 15 percent this year. Rail transportation costs were $39.3 million, a 55.2 percent decrease that resulted from volume shifting to other modes of transportation. The cost of transporting mail by water to domestic offshore and inland destinations was $29.9 million.
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