Interesting and quick read. Looks like they saw a 6.5% increase in FE in the city and 4.6% on the combined cycle. Note though that they don't really tell you if they compaired that to 5W-20 or 5W-30. In any case, thinner oil is better as long as it can still protect the engine!
Quote:
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When tested in Gordon Murray's T.25 city car, Shell engineers discovered that the new engine oil increased fuel efficiency by 6.5 percent in city driving and 4.6 percent on the combined cycle.
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Shell pushes lubrication boundaries with fuel-saving 0W-10 synthetic motor oil — Autoblog Green