This simply isn't true. I just bought my wife a new TDI and she had a kia prior. Her kia had no power and got low 30's milage. The new one is a rocket and gets mid 40's average. Her fuel bill has been cut nearly in half despite the cost difference.
Dependingon the vehcile you might get diesel smell... true. Her car doesn't smel at all. The trucks, turned up, straight piped, yes. The old ones especially. Doesn't bother me. I've grown to hate the smell of gasoline and it's funny how people who drive gas cars don't smell it. this especially applies to the drag strip and car show/classic car guys. However race fuel does smell good to me.
6.0's were junk unless you did a "bulletproofing to them" They can be made to run. They had some major inherent design flaws. It really isn't a champ to be compared in this discussion through as I began talking about a 4 cylinder TDI VW engine which is a common rail, inline design with fixed vanes. The 6.0 is a V design with oil fired injectors and a variable vane.
Make no mistake the diesels can be VERY fast, specifically the duramax if your talking 1/4 mile type performance. But that really isn't what they are for.
