For Mykonos, it's impossible to give you an "average" because the island has hundreds of restaurants ranging from cheap gyro and souvlaki shops to ultra-expensive restaurants serving world-renowned international cuisine. But here's a link to a post from the "Top Questions About Mykonos" box on the Mykonos forum page that will give you plenty of information about Mykonos restaurants: tripadvisor.com/ShowTopic-g189430-i401-k5465…
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