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it should not, the only stuff that gets downloaded is meshes, and then pings to the auth server that shouldn't be that much data.
the meshes themselves from people who have everything cached from the main zones are around 500mb if not a bit more. but once its downloaded it shouldn't have to redownload it unless theres been an update to the entire zone,if theres an update to just a section it will redownload that small section.
id suggest you try and find an unlimited use plan, i pay $70 a month, not only for the speed, but because its unlimited. so that would be something to think about.