Data? No, but ... I'm a die-hard Evinrude fan and 'so far' every legitimate test I see shows the Opti being a little better in the fuel department. Though for heavier boats, I'd still go with the Rude, with either a Merc Enertia or Bomb Rebel prop

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Personally, I'm waiting a few years before I throw a new 250 or 300hp on the stern ... want to see who's still best after a few seasons of use.