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post #1 of (permalink) Old 12-26-2018, 01:16 AM Thread Starter
1234F678g0
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low gas mileage on 1991 b2600i

recently acquired '91 b2600i truck is only getting about 13 or 14 mpg. the tailpipe is sooty too. what can I check to ensure I am getting the best mileage it's capable of?

thanks
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