ok I just started doing this been busy. (first step) I made the modification to my oxygen senser and that is all at the present and that made a great deal of difference in my MPG. I have a 2004 chevy crew cab w/6.0 V8. I was getting 8-10 MPG in town and 12-14 on the high way. now I'm getting 12-15 MPG in town and 16-19 on the highway and these figures are with the A/C ON. with the A/C OFF I'm getting 12-16 in town and 20-26 on the highway. I'm liking that. BUT it's hard to drive with the A/C off in 115% heat for long periods. I live in so cal near Pam Springs. jfyi
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