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Old 07-16-2011, 12:24 PM   #12 (permalink)
Joenavy85
Making Ecomods a G thing
 
Join Date: Jan 2011
Location: Illinois
Posts: 655

Angie - '08 Infiniti G35 X
90 day: 22.03 mpg (US)
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My rule of thumb is to use it as needed to remain comfortable. Hotter temps can cause physiological stress that can effect your driving and your perception as well as your reaction times. I'm much more alert when I'm cool, and get drowsy when it's warmer in the car. I'll take the penalty to remain comfortable and safe.
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