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How many miles per gallon in a 99 chevy suburban with 5.7 motor?

The fuel efficiency of a 1999 Chevrolet Suburban with a 5.7L engine depends on several factors, including driving conditions, vehicle load, and maintenance history. On average, a 1999 Chevy Suburban with a 5.7L engine can achieve around 14 MPG (miles per gallon) in the city and 17 MPG on the highway.