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stock tune eco will take 87, and run just fine.  You won’t have all the power and torque, and neither will your v8, but will run just fine.  Lower than 87, I’m not able to say. 


The added weight of the 7.3 is a thing, the truck is already 5700 pounds and I can see the 7.3 gaining some traction in the aftermarket world.  If that translates to a good option, great.


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