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john1701a said:
I have clearly seen a minor MPG improvement and read about many other whom have experienced the same (1 to 2 MPG). That alone is enough to cover the extra cost.
What kind of synthetic oil?

If you are using Mobil 1, note that Mobil 1 in *W-30 is on the thin side of the SAE 30 viscosity range (in cSt at 100 degrees C). That may account for the slightly better fuel economy compared to other *W-30 oils.
 
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