Greetings Joaopcf,
My initial thought was what you would be using to "dilute" your high gravity beer. My second thought was exactly how high the high gravity beer was. My third thought was why you would want to dilute a high gravity beer. Perhaps you could offer some additional information? I have combined beers for various reasons. One, of which, was to improve the flavor of a higher gravity beer that really didn't taste very good.