It's cold out, no doubt about it. However, leaving your keys in a running vehicle, unattended, isn't only attractive to would be car thieves, it's against the law. 625 ILCS 5/11-1401 states: "Except for a law enforcement officer or an operator of an authorized emergency vehicle performing his or her official duties, no person driving or in charge of a motor vehicle shall permit it to stand unattended without first stopping the engine, locking the ignition, removing the key from the ignition, effectively setting the brake thereon and, when standing upon any perceptible grade, turning the front wheels to the curb or side of the highway. An unattended motor vehicle shall not include an unattended locked motor vehicle with the engine running after being started by a remote starter system." The too long didn't read version...unless you have a remote start, do not leave a running vehicle unattended.