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<p>[QUOTE=&quot;900fine, post: 1000082, member: 6036&quot;]Consider the notion that different fuel sources leave different trace elements in the exhaust gas, and that difference can account for different behavior.</p><p><br /></p><p>For instance, coal is much dirtier than natural gas; coal tends to have more sulfur. There is some conjecture that trace sulfur from coal combustion might conceivably impart toning.</p><p><br /></p><p>As to whether that actually happened or not is a different issue; I&#039;m only mentioning it as a possibility and perhaps part of the OP.[/QUOTE]</p><p><br /></p>

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