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I think it sometimes can be pronounced like that... as a joke or something.

Chris, the question was:
Isn't is always pronounced as v when there is an (-)его or -ого part in a word?

No.
Огорошить, огород, огонь, много, Егор, легонько... In all these words "г" is pronounced as "g".

Yes. It's pronounced as "v".

In "сегодня" it's pronounced as "v" too, because this word is formed from сего дня ("of this day, at this day").