Happy Holidays, Pete.
I'm sure you won't be hearing back from the office until next week, if not the first of the new year.
In the meantime, there ARE things you can be doing to prep your truck:
Get your ride's chi and chakras all aligned before seeking nirvana in the groove
-Have you watched all the YouTube Videos on the Gadgetman channel?
-do you have a way to monitor how your engine responds to the changes you make?
-start keeping track of your mileage if you aren't already
-clean your throttle body and IAC valve, adjust your idle to factory spec
-have you cleaned your air filter and MAF sensor lately?
-sort out your truck's electrics so that the ECU gets clean signal from all sensors. Grounding is key
-Increase your spark plug gap size, which effectively advances your engine timing, but may expose ignition system issues
-check your engine's compression and make necessary repairs.
-seek out and destroy engine vacuum leaks.
-check for exhaust leaks as well
-how old are your truck's oxygen sensors? are they of an age that they should be replaced?
-Have you read up on the MPG Remedy? a bit of Chemistry can go a LONG way
-what other mods might you be able to perform on your engine to maximize its efficiency in advance of the groove? on my truck, there is a thermostat replacement, an EGR system defeat and a cooling system bypass, an electric fan replacement...Heck, even things like wheel bearings and alignment, electrical system load, aerodynamics can have an effect on your fuel consumption/energy efficiency/greenhouse gas emissions. I'm sure you'll find a few when you start digging in to it.
There's a good list to start going through until you hear back...all of these will lead to knowing your vehicle REALLY well, so that you can deal with curveballs as they come. Remember, this is a process, a quest you're embarking on rather than a quick fix or miracle cure.