Yes, but the gas V10 engine will easily beat the diesel in a drag race, and this is what's important to the buyers of these vehicles, not fuel economy. Not many people know, but thats pretty easy to fix.. Unlike a gasoline engine, a simple performance chip can easily add 100hp and 200ftlb to the larger turbo diesels. Combined with a few other modifications, it makes for a very reliable and very quick truck, often resulting in even better fuel economy in the end. But, then again, most people dont know that.