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California ( KPIX ) -- Once a month, a bus full of dads from the Bay Area makes its way through winding country roads, driven by a single obsession: finding the perfect burger.

"More than anything it's a silly, silly topic that we take very, very seriously," said Yair Levin, one of the founders of the Marin Burger Club, a group that bills itself as the most data-driven burger association in the world.

On a recent foggy evening, they found themselves at Coastal Kitchen, a restaurant in Dillon Beach, where chef Zachary Agas served up his famous Dillon Beach burger.

"We have sauteed mushroom onions with garlic, crispy bacon on top and then we're just cooking it to perfection," Agas said.

In the last 12 years, the Marin Burger Club has tasted more th

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