The latest Chrome Beta for Android includes a hidden experimental data compression feature to reduce cellular data usage and speed up mobile web browsing, using proxy servers hosted at Google to optimize website content. It works similar to Opera Mini or Opera Turbo feature found in Opera Mobile and the desktop version of Opera.
To enable it, visit chrome://flags in your browser and select "Enable Data Compression Proxy" and tap "Relaunch now".
After relaunching the browser, you can see how much data you've saved by opening a new tab, typing chrome://net-internals and selecting the "Bandwidth" section in the left sidebar. Then visit different sites in a different tab and check the stats.
Google's proxy is faster than Opera Mobile's Turbo feature, while saving almost the same amount of data. For example, the savings for AnandTech.com were 48.9%, while Opera Mobile Turbo's data savings were 50%. The savings for apple.com were 60.3%, while Opera Mobile Turbo's data savings were 57%. Chrome's major advantage is that the proxy doesn't slow down browsing, unlike Opera Mobile.