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Re:Leaded fuel reduced IQ of children born before 1990 by jandrese on Wednesday October 20, 2021 @12:49PM (#28932929)
The blame lies at least partially on Lycoming, who developed a nice engine in the 60s and then apparently fired their R&D department.

This is a little unfair, but only very little. The engines are primitive by modern standards because the company is wildly conservative in their design philosophy. The engines are quite reliable if run within their design envelope and maintained according to the manual, but it requires considerably more maintenance per operation hour than a modern car engine and most modern car engines are even more reliable when properly maintained.

Re:Leaded fuel reduced IQ of children born before 1990 by MaxBarraclough on Wednesday October 20, 2021 @04:18PM (#28935879)
Some Lycoming engines run fine on the right unleaded fuel.

https://en.wikipedia.org/wiki/Avgas#UL94_(formerly_94UL)