One thing I find surprising in Gear Vendor instructions is that oil needs to be changed every 5000 miles!
See this thread -- and links in Post #13 -- for one mans' solution to this.
My Gear Vendor's Experience.
And here's a thought experiment with merit:
Reversing an NP-205 in a Re-Gearing Strategy
by a man I believe has also been a member here (but not recently).
Now, from the referenced post #37, the "generic TD map":
I'll print this up to keep in the truck -- and the explanation -- and change my habits. Tried to keep it simple (which worked well), so, as a few years have gone by having moved from 18+ around town to 20 for calendar year intervals (where highway miles are set aside); I'll see if I can't get that next one or two mpg on a regular basis.
Was reading around today and came across a pretty decent conversation (okay, it's Ford, but you'll get used to the odor after awhile). Big Dave shows up on plenty of these Ford FE "conversations", no surprise:
FTE: What is the 7.3 Sweet Spot?
And some other Ford TD interest:
Single Post: BSFC Map Value Loading
.