I didn't read all comments, but my 2013 Patrol needed (18.000) 21.000km to become free and running smooth.
Give time to time, specially in winter...Even in our ethernal spring I do not pull full throttle before 6km. In winter the engine never heats up at all.
In the beginning let´s say 5000km forget about the 4th gear.
If you do not install a rev meter, then take as rule. If you test throttle response and no speed response comes, go down a gear and slow down until the engine sounds right and you feel it happy.
The week point are the pressed cranks...they bend and kill the engine. These engine need to rev freely.
With EACH oil change you will see positive changes. (My personal opinion and often from others blamed...DO NOT USE SYNTHETIC OIL UNTIL THE ENGINE IS REALY FREE. Give her at least 5000km dinosaur blood elixir )
So until AFTER 5000km you might think for needed power / steep slopes and/or strong head wind.
1st gear 23-25mph
2nd gear 32-35mph
3rd gear 48-54mph
which are 4500 to 5500 revs.
The bike is the one who dictated the speed, specially when new.
After that you can rev in 3rd up to 54-55mph and get into 4th. Under 48mph the 4th should never be forced. I use it only as overdrive in our mountain range.
When the engine is really free you can roll at 2000revs and pull out slowly from 2500-3000 revs, but happy is the engine at the same 4500 to 5500 revs: the sweet spot. ex factory.
My own experience with new or recently overhauled engines in snow ...they do not like it and you pay a high price in not waiting until spring like weather. (Yes Sirs, I too spent a few years in nice snow when the Weicheier / soft eggs stayed in warm pubs)
Hope that helps.
Patrol 2013 with quite a few add-ons from Jim Petitti.(RIP)
8 weeks 12.000km Oregon - Alaska - Oregon, Engine broke free at 21.000km now in CR 39.000km and counting.
With a DIY foam air filter the rig runs well even in tropical rain. The air box looks then like an aquarium.
Final drives: 1. at 5000km, 2. at 34.000km(+friction plates)
The Avatar are 2 rice grains stating life's essence:
"The most important you cannot see!"
=> Attitude makes the difference!