$0.52 A Mile To Operate The Average Car: The latest AAA study says that “owning and operating a new vehicle in 2007 remains basically unchanged from a year ago at 52.2 cents per mile, or $7,823 per year, when driving 15,000 miles annually.”

Largest Credit Card Breach By Hackers Ever: If you have a T.J. Maxx or Marshalls store card, keep a close eye on your credit report:

At least 45.7 million credit and debit card numbers were stolen by hackers who broke into the computer systems at the TJX Cos. in Framingham and the United Kingdom and siphoned off data over a period of several years, making it the biggest breach of personal data ever reported, according to security specialists.

TJX, the Framingham discounter that operates the T.J. Maxx and Marshalls clothing chains, also reported in a regulatory filing yesterday that another 455,000 customers who returned merchandise without receipts had their personal data stolen, including drivers’ license numbers. “It’s the biggest card heist ever,” said Avivah Litan, vice president of Gartner Inc. This was obviously done over a long period of time, in many locations. It’s done considerable damage.

Road Sign: The sign you don’t want to see on your way to work, especially if you have an important meeting to attend…