S&B wrote:

My point is to not rely solely on electrical components/indications

I agree. This is why I always take along a cross country flight log
with blocks at each waypoint for estimated time of arrival and actual
time of arrival. En route, I use this log and a clock to monitor fuel
usage.

OK, so the XC log is produced by Jepp's FlightStar flight planning
software, but I could produce one by hand if I had to.

--
Peter