We rented a car from Avis in Scotland. The final bill came to 307 GBP, which according to the Visa currency conversion calculator for the day of the transaction should amount to $390.7. I was charged $412. The charge went on my Chase Sapphire Preferred, which has no foreign transaction fees. Even with the potential for DCC, I don't see how 307 GBP could amount to 412 USD. I disputed the overcharge with Chase and they are crediting me for the difference.

I guess I will have to wait for the monthly statement to see what currency conversion rate they used and if this is a case of DCC shenanigans. Unfortunately there doesn't seem to be a way to see the foreign transaction rate on the Chase web site.