My 3.0L MB diesel in our Navion is a lot quieter in the cab than the V10 in the Sunstar, it replaced. Lots of great standard features on our Navion and the 2020 models have been improved in that department even more. As sadie says better fuel economy than gassers, and I also agree with "hard to justify ever going back to a gas powered model". Not impossible, just improbable.