Need more data to demonstrate the power of mobile? Well, 69% percent of U.S. online adults now use mobile in-store -- mainly to look up prices, product information, promotions, or customer reviews -- according to fresh Forrester findings. People also frequently use mobile devices when they are on the go, with 68% of U.S. online adults using them in their cars (big no-no!), and 69% when outdoors. Even if only 29% of U.S. online adults purchase via mobile, mobile has become an essential touchpoint on the path to purchase, with 47% researching products via mobile. Meanwhile, 32% percent of online adults admit to multitasking regularly on multiple devices, making mobile phones central in second-screen experiences when people are watching TV ads. Yet, despite its obvious might, many marketers continue to treat mobile like a second-class channel. “While consumers use mobile as a sixth sense to digitize the offline world, marketers still think of mobile as a subdigital channel,” Thomas Husson, a principal analyst at Forrester, notes in a new blog post. Among other reasons, that may be because only 27% of marketers surveyed told Forrester the ROI of their mobile marketing campaigns was profitable. Yet, the research points to its finding that 67% of marketers says they simply can’t measure mobile ROI!