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  1. M

    6.5 Poor fuel mileage and loss of power

    I have a 1994 GMC with a 6.5 turbo with a 4:10 rear end, in the past I have always gotten about 18 mpg empty and about 15 - 16 mpg towing presently I am getting 13 mpg empty and 10 mpg towing. the engine starts well, runs smoothly, burns no oil, runs excellent except for the loss in fuel...
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