I didn't know that about being the same for any wheel fitted to the vehicle. I used think it depended on tyre profile, wheel size etc but of course it's linked to the weight of the vehicle.
An SLK R171 with lots of toys and a Golf Plus for fishing.
If the wheel/tyre setup is exactly as it was when the car was supplied then the fuel flap is telling the truth. I asked this when I got mine and I was told different stickers for different wheel set ups. I did then go and mod the rears, dohh!. But, in any event, the pressures for the 225s' seem OK for the 245s'.