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Caveats aside, that does make sense... I don't know either way so am at the mercy of internet knowledge.
CSB.... When I was a kid I lived in sugar cane land in Queensland. Every season they would burn off the old crops. Thousands of hectares Just up in smoke. Just imagine if that had been mulched and turned into biofuels instead.
TRA
@Dammit
This from Wiki (usual caveats apply):
Microwelding of the exhaust valve and valve seat is now thought to have occurred due to the increase of flame front speed when the switch to unleaded came about. The increased combustion pressures caused microwelding in older style motors that had the valve seats machined into the cast iron head. Retarding the timing of the engines reduced the combustion pressures and proved to be an effective short term measure in the switch to unleaded fuel. The long term solution was hardened steel valve seats.