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Trucks get a bad reputation for gas mileage, or at least they have historically. This is starting to change in the past two model years and will continue to accelerate going forward as trucks are seen as a competitive option to cars and especially full-sized SUVs such as the Chevy Tahoe. It is truly remarkable that you can take a 5,000 pound vehicle down the highway at a rate 29-mpg without using a hybrid powertrain, but that's exactly what they've done with the new 3.0 L turbo diesel. This makes it a great option for long road trips so we decided to test it out on a drive from San Diego to Paso Robles, CA to check out some Central Coast wineries.