Yes, conceptually it's kind of an interesting question: what exactly is
ambient temperature and how the heck do you measure it? Temperature without
wind chill, ice accumulation, UV accumulation, direct sunlight, heat from
roadway, heat from lights, heat from radiator, heat from direct sun...

I'm sure the meteorologists have a way to define this, but for us, it's
never going to be an exact science, esp. with those cheesy thermometers from
Walmart.  (Ever notice how they're a few degrees off even when you put the
exterior sensor right next to the main thermometer?) All I know is that if
you put the sensor above the gas tank, you start think the globe is warming
faster than before. It always reads 120 or so, because of heat from the
radiator, etc.

Wheelwells, area behind turn signals, space above spare tire all seem like
pretty good places,  though.