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What is the gas mileage on a 1977 Chevy Blazer?

The gas mileage of a 1977 Chevy Blazer varied significantly depending on the engine size, transmission type (automatic or manual), vehicle condition, driving style, and even tire pressure. There's no single answer.

However, you can expect very poor fuel economy by today's standards. Estimates typically range from 8 to 14 miles per gallon (mpg) in combined city and highway driving. City driving would likely see even lower figures. A larger engine would result in lower mpg than a smaller one.