Is it true that possible to reduce the CPC by changing the currency?

Is it true that possible to reduce the CPC by changing the currency to a smaller one? Anyone tried to do it?

I tried it but it didn't work. Adwords simply won't show your ads. The expense will be the same, they are smart.

When ads are eligible to be shown, the ranking formula (QS x bid) takes into account currencies and the exchange rate at the time. This puts all ads on the same footing, no matter what currency you use. When an ad is clicked, same thing since the ranking was based on one currency, they just bill you for the click in the chosen currency.

But the step of the rate is smaller?