Gas Mileage Ques

I hope this is the right place to post this question. I'm considering buying a one owner 67 Dart with a 225 and an auto trans. The car is a bone stock 2 door post and has never been altered with. It is currently sitting in a barn and the owner says it runs and drives fine and will only need a battery and a fresh tune up. What kind of mileage will this car get without doing a lot of mods and actually driving it right? Thanks for any info.

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