>> I camped for several days at East Park Reservoir
>> in northern California. Daytime temps exceeded 100F, and the reefer ran
>> almost continuously.

This doesn't match my experience.  I ran some tests on run-time and
voltage drop, etc, etc, a year ago and posted the results.  A
quick search would find that link.  ;-)

But relevant to your comment:  The most I have observed mine to
run is 1/3 of the time--"on" four minutes, "off" eight.  That
was in Moab with hot temps.  In more humane temps it runs 1/4 to
1/5 of the time.

I run mine with the temp setting at "five o'clock" usually.  If
I have icecream sandwiches in the freezer, then "seven o'clock."

I measured current once and found it was drawing more than the
spec.  I moved the source directly to my aux battery instead of
the normal path for the kitchen wiring that goes through the
fuse box, but haven't measured it since.

[Please don't tell me about your phone--it gets dumb after the first time.]

Richard