Ever get annoyed when car ads hype pie-in-the-sky mpg figures? Well, you aren't alone. Advertisements are notorious for shilling highway-only mpg, sometimes for specific trims that aren't widely available. Witness a Mazda commercial from 2012 that blared 35 mpg highway for the 2013 CX-5 SUV — an EPA figure only achieved by a front-wheel-drive, manual-transmission model. Or one of Ford's 2011 Fiesta ads that rolled "40 mpg" across the backdrop, which only the automatic SE with the Super Fuel Economy package received in EPA highway ratings.
Both ads clarified the details in the small print, but you'd have to pause the DVR and get out a magnifying glass to read it. If a group of consumer, environmental and safety advocates get their way, such practices could change.