I say it like Rousseau. Dayda on its own, but "DATa" when it's attached to another word, as in "data plan". There could be a slight difference in how we pronounce it, but it's not a foundational one.
For example, a really strong difference are TH and ING words. If not fully enunciated, most North Americans would clip the G and say something close to "nuthin'." Newfoundlanders, 99.9% of the time, clip the "th" instead so it'd be "nudding", with a
very strong D and ING. Clipping the g is actually uncomfortable for us in our throats, try it.
It's like trying to talk with your teeth it's so far ahead from the normal place in the throat we speak from.