Blackstone Labs is an oil analysis company. I know a handful of users here have used them including myself. They really do a great job at analyzing oil, how your engine is wearing, and where you might be having issues. While they have many fancy tools for analyzing oil, they don't have the best equipment for measuring mileage on cars. However, they gave it their best shot and wrote up this report on conventional vs synthetic oil for fuel economy.
Summary:
Quote:
SUMMARY
Oil / MPG (Conventional / Synthetic)
Vehicle A:
Quaker State 5W/20 28.08 (C)
Royal Purple 5W/20 27.95 (S)
Vehicle B:
Mobil 1 0W/30 (1st) 33.53 (S)
Mobil Super 5W/30 35.16 (C)
Adv. Auto 5W/30 32.93 (C)
Mobil 1 0W/30 (2nd) 34.46 (S)
There are so many factors
that affect how your engine wears, what kind of mileage you get, and how long your
engine will last that we could never issue a blanket one-size-fits-all statement saying “You should use X.”
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Better Mileage with Synthetic?