They probably had it turned on while doing their work (lots of electricity used for nearly zero miles) and the guess-o-meter got a little out of whack. I bet it's back to normal-ish within a few weeks. Your range is almost certainly not actually changing.
Same occurred for me - had the 2 year service a little more than a week ago and range has diminished, but I am guessing that it will come back as I drive the car more. Same thing happened when I took the car in for the 'big' update. Range came back after a few weeks of driving.
With only 530 miles and a late December '22 delivery I have a way to go, but curious about what service is done at the 2 years. I've no doubt it is crazy expensive as Porsche service normally is as Ive learned over the past 7 years.
The service requirement occurs at first of 2 years or 20,000 miles. I am shy of the 20,000 miles so it was 2 years for me. Brake fluid change, wiper change, cabin air filter change and just overall safety mechanical check. Some have reported upwards of $1,000..........mine was just above $600. I doubt that I will get it done again in 2 years as car will be out of warranty period. I questioned the brake fluid change and service rep reported that Porsche recommends fluid change every two years. I cannot imagine why as most of the braking is completed by regen versus actual brakes unless you are hitting them really hard. I do, but even still no way does the fluid get hot enough to deteriorate. Different though if I was hitting the track hard and regularly. In my younger life I completed 15-18 Drivers Education events per year and changed the fluid before each event. Never had a problem with fad, etc., but that is a far far cry from normal aggressive street braking.
I "lost" 30% of reported range after last year's major software update (uPdate) but recovered a few weeks after.
Brake fluid replacement has nothing to do with the use of the braking. This is only time based due to moisture building in the hydraulic lines. For example, my 2008 Acura TSX has a 3 year brake fluid replacement interval, so I assume these intervals differ but for the dealership this is a recurring business profit maker since regardless of if you are driving it or not, they will flag you for this service. Now, they are proactively replacing keyfob batteries without me asking at $15 and so on, plus mandatory shop supplies at $35-$45 per visit.
Brakes need to relearn after this service and then recuperation will return.
