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I find this section interesting also. I switched 2 of my vehicles, a 2001 Ram 1500 2WD 5.9, and a 2004 Ion 2.2 Ecotec. Both run smoother and quieter. Even my 21 year old daughter who drives the Ion asked what I did to her car because she could not tell the car was running while stopped at a traffic light. Neither vehicle has shown a decrease in MPG. I have a 05 Mustang GT I would love to switch over but that 4.6 calls for 5w-20 and I believe the GC would just be too thick.