Starting and running at -40 with only Power Service, wow, but do you actually add the 911 routinely?
In my opinion you have been very fortunate.
My tractor is still mostly summer fuel, with the projected cold snap we had over Thanksgiving, I did
add 5 gallons of K-1 kerosene and an extra dose of Power Serve, the same routine we did on the farm.
Every thing that needed to started and ran.
I have a block heater in my pickup and my tractor.
I have contemplated on wrap on heaters for the hydraulic filter and fuel filter on the tractor.
Both engines are on synthetic oil Rotella T6 5W-40 and the tractor has semi-synthetic hydraulic/transmission
fluid in it.
The block heaters are just to be nicer to the engines and batteries and starters, they have started unplugged
when needed, but why if it can be avoided.
One timed jelled and stopped in the cold will alter your thoughts on fuels.