As a GM owner since 1976, and doing my own servicing since 1969 (on my Dad's 1967 Oldsmobile Cutlass Supreme), I always follow the printed owner manuals. Don't follow the dealer's "recommendations" or the newer online manuals. GM writes their owner manuals after the development and testing (both "alpha" and "beta" tests) of their new models and check out all needed maintenance, so the owner manual is written and published at the time the regular production begins. If GM discovers any problems after the model's first year, they will edit the manual and publish a new version (sometimes they offer the updated manuals for free).
So if your 2014 Chevy Volt owner manual has a schedule for maintenance and servicing, follow it. In some cases, you can delay the service as you learn more about the vehicle model, but doing it ahead of the schedule is a waste of time and money. My last two vehicles have given me many years (over twenty) of great trouble-free service even when I skipped some of the steps. And as a present 2009 Chevy Equinox owner, I only follow the schedule in the manual, although the dealer has tried calling and sending emails to do otherwise (to make more money). I change the engine oil once a year with synthetic (as I have done will all my previous cars since 1981) and its engine coolant only once. Yet it still runs like it was new!
As more EVs are produced, the schedule will be easier and have less steps. I bought the 2015 Chevy Spark EV Owner Manual, and I have posted about it here (search for it). The 2017 Chevy Bolt EV Owner Manual is already online for free, so read it and see ahead how simpler your schedule will become.