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I am wanting to put a chipor a programmer in my 2003 <NOBR style="COLOR: darkgreen; FONT-SIZE: 100%; FONT-WEIGHT: normal" id=itxt_nobr_1_0>F-250</NOBR> 7.3L Super-duty 4X4 but i don't know which one to get. I am needing something to boost my gas mileage both in city and highway and with the most power i can get. Any suggestions an what i should get and what is the best chip for my application