If they are getting $$$ for this (which they would somehow, or they wouldn't offer it), they will have a strong incentive to keep a very good up-to-date database. There are few enough charging stations that it would be trivial to have people call up the companies and double-check every once in a while.
Originally Posted by mikeg3
Personal Best Charge: 57.2 miles
Best Day: 71.3 miles, no gas (49.9 on full charge, 21.4 on ~4 hours @120V)
Over 4 billion pieces of data collected on the Volt OBD2 port