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What gas mileage will you get on 1964 thunderbird v8 390?

You won't get good gas mileage in a 1964 Thunderbird with a 390 V8. Expect to get 8-12 miles per gallon (mpg), and possibly even less depending on driving style, vehicle condition, and type of driving (city vs. highway). This is a large, powerful engine in a relatively heavy car, and fuel efficiency was not a priority in that era.