The other day, AutoblogGreen's Lascelles Linton recorded a Hummer commercial that is still advertising the behemoth's old EPA mileage numbers. On dealer lots, mileage stickers needed to update to the new EPA numbers in June. What gives with the TV ads? In more serious news, AutoblogGreen's Sam Abuelsamid spent some time with GM's new HCCI Engine and if you're at all curious about this new technology, his report is worth a look. There was lots more news over the weekend, as this list attests:

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