I am glad to see I'm not the only one who has done this!
Ever since my first Garmin GPS, I have always switched to the Australian accented English because it 'felt the most accurate'. But thinking about it now, it's clear the reason was that US and British English is so common to my ears that I noticed every flaw. Australian was just unfamiliar enough to have me focusing on decoding the street names rather than noticing the unnatural gap between two phenomes.