MPG have been down??

[countryraised]

well I have the FU... so I have most of them available to me. I'll load it back up, before my next fill up.
Had the 80dd on it right off the bat, but switched out, every time my wife takes off with the truck gravel flies, so I thought i'd tone it down, it hasn't mattered. that and going into winter don't want to be spinning all the time. What have people seen using the 80tow for normal driving? or the 80 perf?
Also, when I unplug the wastegate I can get the SES light to come on with an over boost code, I thought that was disabled? I also have gotten the HP oil code, and the exhaust pres code.