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What mpg should a 1999 5.7 1500 4wd suburban get?

The EPA estimates for a 1999 Chevrolet Suburban 1500 4WD with the 5.7L engine are typically around 14 mpg combined (city and highway). However, actual mileage will vary significantly depending on driving habits, terrain, vehicle maintenance, and the condition of the engine. You might see slightly better fuel economy on the highway and considerably worse in city driving or off-road situations. Don't be surprised if you get less than 14 mpg overall.