I ran a 987.1 Cayman S for just under 5 years. MPG was around 25 average. Great engine and gearbox, amazing handling. Servicing isn’t too expensive. It was a great car and I sold it because I had bought new house, got married and a baby on the way.
Issues I had during ownership:
-The big issue was an engine rebuild. I went porsche approved used. Over the first 3 months of ownership oil usage was high (1 litre per 200 miles) with the tell tale white smoke on cold start from a single exhaust side. Porsche did a rebuild with over half a new engines worth of components under warranty. The issue is widely spoken about on forums. I would have been more cautious when buying if it was a private sale. Insist on seeing a cold start and watch the exhaust. The quoted price I saw for the work was ~13k, but I’m sure this is the full price and wasn’t what porsche paid the dealership or what it would cost at an Indy. The Gen 2 engine was meant to be much better for not causing bore scoring and this issue.
-plastic gear linkage broke (lose 1-2, 5-6, reverse). Was recovered to a garage, but a cheap fix overall and know potential weakness
-There an intermittent cabin rattle from the back right of the car
-AC radiator leak following stone chip
-otherwise it was consumables - replaced both front springs (I blame pot holed roads around Buckinghamshire and Berkshire), pads/discs...etc
-The sat nav is ok. I found it better than the Gen 2 ford system I have now. You can ‘find’ online update discs to add more recent post codes and roads.
-it was my daily and only car during that time, so had to rent vans for any significant moving
It was a great car to drive and I do miss it now.
I had 987.2 and 981 hire cars. The 981 is a much larger jump in performance and interior. I would definitely aim for the 981 if you can, but life has a budget and I bought my 987.1 when the .2 was out!