Ford Enthusiast

[dieselman]

I'd stick with the 91 octane setting. Keep in mind, superchips is a performance option, it's not meant to give you better fuel economy. It just happens to be a side effect from some superchips users. You can also take the superchips tune off your truck, and run a tank or two of fuel to see if the gear change is what made your mileage drop. I doubt it is the reason, but you never know and it worth a check. For shift points I'd only raise it 400rpm per shift, so there won't be excessive 3-4 shifting around town.