10 Most Fuel Efficient Full Size SUVs For 2017-2018. While full-size sport utility vehicles have long endured the gas hog label due to poor fuel economy, things have improved substantially in recent years. High gas prices and pressure from Washington, D.C. pushed the auto manufacturers into action. Every entry on our list of 10 full-size 2017 SUVs with the best gas mileage is rated at over 20 miles per gallon combined, with the top of the list dominated by hybrids (along with a solitary turbo diesel). Sadly
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