The efficiency and mileage icons on myvolt.com are no longer grayed out, if you go to www.myvolt.com but do not log in.
If you click on efficiency you get the following message:
MyVolt.com will soon give owners real-time efficiency data on their Chevrolet Volt in three useful views—the last 7 days, the last 30 days and lifetime. Plus, more detailed reports on everything from overall gas consumption to total kW-hr usage will only be a click away. Feature available early 2011.
And the mileage icon gives you the following:
MyVolt.com will soon offer owners a detailed view of their Chevrolet Volt's mileage history. Just select a desired timeframe—be it the last week, month or year—to access charts displaying everything from MPG figures to the total number of EV miles you have driven. Feature available early 2011.
Also, in my latest Onstar report there are some new report but they don't yet take you to anything.
Finally at the top where it says "Having trouble viewing this email? Click here." Doing so will take you to an Onstar page. Under the "history" tab mine is showing bar graphs for average daily miles.