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Hmm. I also got a drop in fuel economy (by 5%) w/ M1. This was after switching from Delvac 1 5w40 and Rotella T syn 5w40 to M1 10w30 by itself and M1 10w30 w/ a little M1 15w50 added. That's one reason why I don't use M1 anymore. The 10w30 also seemed pretty thin in comparison to the D1. I...

I started using synthetic at 140K mi in everything (D1 5w40 in the engine, Redline in the diffs/tranny), right now have 180K mi. So far, no leaks. Use a thicker synthetic to reduce oil burn.