This study investigates phonetic variation in German dialects by analyzing vowel space areas (VSAs) across seven regional varieties and three communicative settings: dialect-intended speech (DIS), standard-intended speech (SIS), and read speech (RS). Results reveal significant vertical variation, with smaller VSAs in DIS compared to SIS and RS, reflecting reduced articulatory precision in informal registers. While vowel duration differs significantly across age groups, VSA configurations remain stable, indicating robust phonological structures. Regional variation in DIS highlights local phonetic distinctiveness, while overlaps in SIS and RS underscore the influence of linguistic standardization.