Using 0W-20 Oil Lexus '09 ES350

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The Camry and the Lexus share the same engine. Would using this 0W-20 oil in a 2009 ES350 that specs 5w30 be worth any fuel economy or efficiency gains?

According to Car and driver the new Camry V6 :
Quote:
The only powertrain changes, aimed at improving fuel economy, are subtle: lower-viscosity engine oil (0W-20 versus 5w30), a transmission-oil warmer to achieve operating temps a little faster, and a higher (numerically lower) final-drive ratio of 3.46:1 versus 3.69:1. The net, according to the EPA, is a gain of 1 mpg in city and highway modes, for a rating of 21/30. We averaged 25 mpg.
 
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