I recently completed a 3 night stay at the Trafalgar in London. My folio was just under 1,000 GBP. Since HHonors converts to USD for awarding points, they claimed the USD equivalent of my near 1,000 GBP folio was $1,350. My credit card, however, lists the charge closer to $1,650. Does anyone know what Hilton uses for the "published rate of exchange" mentioned in the T&Cs? While I expect some variance in exchange rates, this seems a bit excessive. "Points awarded for stays at hotels within the Hilton Worldwide portfolio outside the U.S. will be based on local currency converted to U.S. dollars. Local currency will be converted into U.S. dollars weekly, using a published rate of exchange in effect at time of conversion. This rate will be determined at Hilton HHonors Worldwide, L.L.C.'s sole discretion, based on standard currency conversion methods but may vary from currency conversion rates used by credit card companies."