nomis5 - 12:44 pm on May 24, 2012 (gmt 0)
So, G is changing your tiles. Presumably because it doesn't like your titles. You don't like the new G generated title.
The solution is to make a good guess at why G doesn't like your title and change it to a title that G will like and you will be happy with as well.
It happened to me on one of my sites and I guessed the reason was that the title was simply a short term aimed at what searchers might search for. For example my title might have been "a very popular search term". Every site was using the same term as the title.
I changed the title to "a very popular search term - mysitename" and hey presto Google stopped amending my titles and used the one in the page.
It may also be the case that your title needs to include a location because your original title is duplicated in many locations. I also tried "a very popular search term in Dakota" and that also worked 100%.
Google is easily confused and they look to you to ease that confusion.