The speedo on my 1998 E350 reads approximately 10% low. Im not sure what is the cause of this. I bought this van with a bad trans, replaced it with one from a 99. The van has 245/75 16s. Also with adding 10% in the tripmeter i still have only managed 17.25 mpg highway at 70. It has a 3.55 rear axle.
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