Ambient air temperature is the current air temperature, same temperature you'd see on the news. There's more to it than just air temperature however, humidity, ambient absolute air pressure and temperature all play a factor in efficiency.
So you mean to tell me that the flux capacitor is only connected to the muffler bearings while the blinker fluid is still engaged?
"Last night I didn't get much sleep so in the morning I made my coffee with red bull instead of water, I got half way to work before I realized I forgot my car."