Posted by MarkB_MI on July 12, 2011 at 18:51:15 from (166.217.234.67):
In Reply to: GAS I AM CONFUSED posted by JR FRYE on July 12, 2011 at 13:41:50:
You're kind of mixing things up. Lead content, ethanol content and octane are three different things. Related but different.
First, the guy who said he put "lead concentrate" in his gas didn't know what he was talking about. The only way you can buy tetraethyl lead is mixed in with 100LL avgas. Forget about lead, you don't need it and you don't want it.
Ethanol content isn't something you have a lot of control over. In some states premium unleaded may be ethanol-free, while in other states ethanol is required in all fuel grades. If you can get ethanol-free gas, do so. If you can't, then you can't. You can test your fuel to see if it has ethanol in it, but don't assume your supplier will tell you the truth. They may not even know.
Octane is important, but most small engines will run fine on 87 pump number fuel. Using premium is a good idea, because it's not that much extra money for the amount you'll burn in a small engine and the extra octane gives you a safety margin in case you get a bad batch of gas. Also premium will usually have more detergent additives and less ethanol than regular. Note that most outdoor power equipment manuals list the minimum octane as Research Octane Number (RON), which is higher than the equivalent pump number. That may lead you to believe you need premium fuel when regular will do just fine.
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