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I have to agree with MRB here too. I have two chips stacked on my PSD. What I have is the heavy foot action in the way LOL. I can say though if I run my 6 position flip chip off and the Edge EZ1000 on the setting of #2 I get better fuel milage out on the road where I have less problem keeping my foot still out of her.
Now I will say this is not how I usually run her though, to much of a performance improvement for me to over look. I run the EZ1000 on three and the flip chip on three as well for a power factor of remarkable improvements. It makes me very much aware of what the 7.3 PSD really is all about and wonder how Ford keeps all this power to them self and not crow about this out loud LOL...
its all in your right foot, ive seen 20mpg on the highway with the hottest program twildman has. in town i get about 15, but thats my own fault....the throttle keeps sticking??? i know richter69 over on the dieselstop gets almost 16mpg on the average with a 400+ hp truck and he drives like a monkey on fire.