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Old Jul 20, 2006 | 5:42 pm
  #7  
ger3sf
 
Join Date: Oct 2004
Location: SF, CA USA
Programs: UA 1K MM, RCC, PreChk , Hertz 5* Gold, HH Silver, SPG Gold thx to Amex Plat
Posts: 490
I got the same question some time ago while shopping (with my US-based card) at Harrods. So, on multiple purchases on the same day, I did some in GBP and some in USD.

When the charges posted on my stmt, I calculated that their conversion rate to USD was to the merchant's benefit. There's no rule that requires the merchant to use the "best" currency conversion rate. So, if asked, I always transact in the local currency.
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