Do you live in an area that goes below 30 degrees and not use a block heater? We did on both our gasoline trucks while living in Alaska.
Sorry for the late reply.
We live in an area where the actual temp can get to minus 40, but the usual low is about minus 30.
I was thinking of my daughter’s Ford pickup. It can be plugged in, and around 10 below is a real problem to start. It has glow plugs, which means ether cannot be used.
I was also thinking of the old gas engines pre-1970’s that had carburetors and non-electronic ignition. Actual temp minus 40, they would start without being plugged in. We had a 2008 Chevy Colorado. It was minus 45. It was not plugged in, took right off. However the plastic door handle broke simply by trying to open the door. When below zero, most diesels need to be plugged in 24/7 so they start for emergencies or unexpected trips.