I have noticed performance chips for the super duties on ebay. Has anyone used them and do they really give you better fuel milage.

 

there is no such thing as chips anymore.

You need to purchase a tuner. You reprogram the trucks PCM with a tuner.

Best ones out there are Banks for DPF on tuners

DPF off ones are Spartan/H&S/DPF R+

The list goes on.

If you drop down to the 6.4 section you will find alot of info

6.4L Power Stroke Diesel - Ford Truck Enthusiasts Forums

 

I think he's referring to the $30-$100 "chips" that wire into your rigs electrical system. These often advertise crazy MPG, HP & Torque gains. It's a plastic box with a few capacitors and maybe even an actual circuit board in them with two wires. I wouldn't even waste my time. I could build one for $5.00 in my garage. I'll make you a deal and sell it to you for $15.00 instead of the eBay price.

 

Moved to the 6.4L Powerstroke Diesel forum.