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Remember guys, factory fill is all about marketing and money! Mobil pays the manufacturers to install their oil in new cars. Oil cap labels are much the same, although recommending a quality oil may forestall damage due to negligent maintenance.
As for M1's FE oils, I'd be cautious. Don't use their 0W-20 in a vehicle that calls for xW-30. Even their 0-30 is on the thin side, IMO, with lowish HTHS numbers. Many European car manufacturers specify stouter oil.
Don't expect miracles from this stuff! Even Mobil only claims a one or two % increase in FE. The OP's 5+ MPG boost is almost certainly due to other factors.
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