Going by driver comments, over many months and years, it does work for some drivers, but not all. Why not address this properly and make the data provisioning worthy of the powertrain, safety features and other high quality elements of the vehicle?
Examples of recent polls and associated driver comments which help illustrate the ongoing issue:
http://gm-volt.com/forum/showthread...-Miles-and-other-data-through-the-web-or-apps
Are you able to access your EV Miles and other data through the web or apps?
[Mid-December]
http://gm-volt.com/forum/showthread...V-miles-and-other-data-Through-which-channels
Issues accessing your EV miles and other data? Through which channels?
[Mid-December]
http://gm-volt.com/forum/showthread...-EV-miles-and-other-OnStar-info-via-web-phone
Are you at this time able to view your EV miles and other OnStar info via web, phone?
early January 2018
http://gm-volt.com/forum/showthread...-Is-OnStar-EV-Miles-Data-Starting-to-clear-up
20180106 update: Are you able to access EV Miles and other data thru web or apps?
Examples of recent polls and associated driver comments which help illustrate the ongoing issue:
http://gm-volt.com/forum/showthread...-Miles-and-other-data-through-the-web-or-apps
Are you able to access your EV Miles and other data through the web or apps?
[Mid-December]
http://gm-volt.com/forum/showthread...V-miles-and-other-data-Through-which-channels
Issues accessing your EV miles and other data? Through which channels?
[Mid-December]
http://gm-volt.com/forum/showthread...-EV-miles-and-other-OnStar-info-via-web-phone
Are you at this time able to view your EV miles and other OnStar info via web, phone?
early January 2018
http://gm-volt.com/forum/showthread...-Is-OnStar-EV-Miles-Data-Starting-to-clear-up
20180106 update: Are you able to access EV Miles and other data thru web or apps?