Should we say Pri Gafna in Al Hamichya in israel and what about on on foods created out of Israel?

I saw a very interesting thing in my bentcher. It says there while making Al HaMichyah on grapes 'when in Israel recite Al Pri Gafnah instead of Al Pri Hagofen' which means say 'the grapes of its land' instead of 'the fruit grapes'. This is because we are anyway speaking about Israel so we might as well say mention that this is the land.

My question is I always though in depended on where the fruits themselves actually were grown, not where you are at the time of your recital? Is this a mistake?
Quite a lot bentchers will have then all made the same mistake.

Does anyone know of a Mekor of it depending on whether or not the person who is saying the Bracha is in Israel or not?

I am pretty sure that you are correct in regards to the fruits origin is what determines the language as opposed to the actual place where you are eating. That being said I also think - Al Pri Gafnah would be for wine and grape juice from Israel and Al Peiroseha would be for fruits including grapes from Israel - will try to confirm this week.

Look in Mishnah Brurah SIMAN 208 SEIF 10 SEIF KATAN 52 - for a clear P'sak that if fruits came from Chutz La'aretz - even when eating them in E"Y you say Al Hapeiros not Peiroseha. Also there does not seem to be any difference between grapes and the rest of the Zayin minim fruits as per my earlier answers/comments so anyone who has a Mikor for saying al hagefen on grapes I would appreciate a response.

I cant remember properly but I got a feeling it is a Machlokes Rishonim on Brachos. We definitely Pasken that it depends on where the foods were from though so the Bentcher is wrong