This year's pace-setters Mercedes considered walking away from F1 before the sport opted to swap to turbo hybrid engines.
During the days of 2.4-litre V8 engines, Mercedes were on the fence about their F1 participation. according to Daimler's Thomas Weber, the man in charge of research and development.
"The key challenge for the future is fuel economy and efficiency and with the change in regulations F1 is the spearhead for development," he told BBC Sport.
Pressed as to whether Mercedes would have walked away had F1 not committed to the efficiency formula, he said: "I think so, yeah because we had the discussion.
"We had at different times the challenge to discuss F1...
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