By far the most affordable avocado toast can be found in the far west of Sydney. The lowest average price was $9 at Werrington near Penrith (although only one local café offered it) followed by Granville with an average of $10.42 (offered in two cafes).

While aspiring home buyers have been blamed for squandering their deposits buying smashed avocado at trendy cafes, the study revealed it is impossible for members of the Millennial generation to waste their savings at many Sydney shopping strips because local eateries don't even have it on the menu.

A quarter of the locations examined had no smashed avo meals on café menus, all of them west of Auburn. Harris Park, for instance, had 15 cafes but not one offered smashed avocado.

The researchers used Google maps, online menus and phone calls to work out how many cafes sold smashed avocado within 750 metres of 47 Sydney train stations stretching from Bondi Junction in the east along the city's western railway line to Emu Plains and Richmond. They also "did a bit of sampling" at several cafes while they "discussed the paper", said researcher Chris Ducklin.