Gas usage habits vary greatly among Volt drivers. In the 6+ years I’ve been driving my 2012 Volt, I exceed my battery range by a couple of miles perhaps once every two months or so (99+% ev driving around home), but also, approximately once a year, I take long vacation drives of 1000+ miles, and try to get a final gas fill up on the return trip when I’m ~100+ miles from home, so I have plenty of gas to make it home with no problems and have plenty left in the tank to eliminate range anxiety for most of the year when I’ve driving on battery power.
Sometimes I don’t depart on my long trip within 12 months of arriving home, as a result of which I’ve experienced 3 FMMs (none included a check engine light). When that happens, I drive until the old gas is used up and then fill up my tank at the conclusion of the FMM, rather than just adding the minimum. I know that after 12 months of local driving, it most likely won’t be long before I’ll be heading off on my next long trip with this nearly full gas tank, but just in case I don’t take a long trip, by emptying the tank before adding new gas, my next FMM will be postponed for 12 months.