I've got a P reg 306 Xnd, I do more miles per year than you and it seems to be plodding on ok with frequent oil changes ( fingers crossed, on about 170k now) I get 60 mpg , but I had to upgrade the soundproofing which improved things a bit on the motorway.The Seat is more comfy than my older accord, I agree that it is probably not wise to drive that sort of mileage in a newish car.. although it depends on how much cash you have to burn.