224 miles would be a squeaker at highway speeds with AC and starting with 90% charge. Definitely sounds like range anxiety to me and would probably take over an hour to charge that high at HR, so an intermediate stop makes sense. Donaldp's suggestion of Manteca would be the shortest route.
Cutting across Hwy152 to Gilroy would give you another option if you didn't want to divert to Manteca. Might be 15miles longer, but Pacheco Pass is a nice drive, you may like the fragrance of garlic, and the route takes you past Fremont on I-680 where you could visit another SC and genuflect before the factory.