The gas mileage for a 1987 Oldsmobile Calais typically ranges from about 20 to 25 miles per gallon (mpg) for city driving and around 25 to 30 mpg for highway driving, depending on the specific engine and driving conditions. These figures can vary based on maintenance, driving habits, and the vehicle's overall condition. It's worth noting that the Calais was available with different engine options, which could also impact fuel efficiency.
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