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So tell me, i have a stock mid 90s Cummins with 90K on the original motor and tranny. I have not been able to get more then 15-16 mpg on the high way doing 70mph. I would be happy with 19 or 20. after speaking to a couple of diesel machanics, they both said to leave it alone and just put fuel in it and drive. No mod necessary to get better milage or power to these earlier trucks. I haven't looked into it since. No additives in the tank but some injector cleaner once in a while. The truck has no problems. I have head about marval's mistry oil in the gas tank to lube the injectors, but have not done so. What do you guys think?
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