I went a website with a responsive design using Adsense. I'm hoping I explain this correctly. Instead of using Google's responsive ad tags, it appeared they were using a CSS in the ad spaces to keep the leaderboards' mobile "resolution" sized down to fit the page with the mobile version of the article. Has anyone tried this? Revenue stays the same? Had a few buddies start using Adsense' mobile ads and their revenue dipped, some by significant sums.