If leaded gas is the only way you can make a high compression engine run, you use it. If being lined with asbestos is the best way to make something fireproof,

If leaded gas is the only way you can make a high compression engine run, you use it. If being lined with asbestos is the best way to make something fireproof, you use asbestos. Combustion engines are still optimal for many use-cases-but CA Central Planning doesn't care about anyone who needs them.