Seems like a no brainer, but if this list is intended to be distributed amongst unlike minded individuals...
"Never idle!"
This is quite possibly the most annoying habit I see, I'll be walking to class and walk by 10s of cars that are just sitting there running so the owner can use the radio or a/c. Worse yet it's generally always a girl just putting on make up while the car is left running. Saw this yesterday with a lifted Hummer H2, almost lost it. haha.
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