TomEV wrote:You should go ahead and install the 50 amp circuit breaker and wiring. It's not that much more expensive.
The FFE is not likely to be your last EV. And, when you get that next EV that can charge at a higher rate, you'll be glad to have a 50-amp circuit installed.
The extra expense will depend greatly upon your particular circumstances. If you have a house of recent vintage with higher amp service than most households really need and your service entrance is in your garage, then the cost differential will be minimal. If you have to upgrade your service to fit the extra 50 amp circuit and you have to route it 50' from a service entrance on the opposite side of the house (instead of e.g. routing a smaller circuit from a conveniently located sub panel that already has enough spare capacity) the extra costs could be considerable.
...bit of a contrarian view here...
Also, consider that the extra utility of 40 amp charging vs 32 amp charging is not really going to be that great for most people most of the time. Sure, you could charge your future EV 25% faster but 240v/32 amps would still be able to dump ~6.1 kW (7.68 kW from the grid X ~80% charging efficiency) into the battery. That's going to be ~25-30 miles of range added per hour of charging (assuming it's not an electric Hummer) or ~300-360 miles for a 12h overnight charge. How many people will need to replenish 300 miles while they sleep? Where the extra amps might help are in situations where you have limited range left and need a quick range boost to, e.g., enable running a bunch of errands after dinner. In that case you would get an extra 6-8 miles per hour of charging. However, future EVs will have more and more range, making the above scenario increasingly less common. There would also be extra stress on the local grid infrastructure from these hours long high amperage loads. Why tax the grid more than necessary with all these future EV owners charging away at 50+ amps when they don't really need to? Public DC fast charging / supercharging infrastructure (MUCH faster than any feasible residential EVSE) should also more readily available in the future.
OTOH, I suppose multi-EV households with long commutes would require a LOT of power dedicated to charging. Possibly a multi-head EVSE sitting on a 50+ amp circuit or multiple EVSEs on several lower amp circuits. It's not clear to me what would be a better form of future-proofing: a single high amp circuit or two lower amp circuits?