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Most of the newer trucks average around 6 mpg. My 1984 International Cabover with a 300hp BC3 got 5.5 mpg and my 1985 Freightliner Cabover with a 3406 310hp caterpillar got closer to 6 mpg. My 1996 Peterbilt 377 got a lifetime average of 7.3 mpg with a S60 Detroit 500 hp.

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Q: What is typical fuel mileage for older diesel semi tractor-trailer rigs on the highway?
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What is typical fuel mileage for older diesel semi tractor trailer rigs on the highway?

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