Re: Low Fuel Economy - Running rich, not sure why
If it idles with the pilot screw all the way in there's something really wrong with the carburetor. (Leaving the petcock on prime shouldn't cause an issue unless the float valve in the carb is leaking).
A dirty air filter can also cause high fuel consumption.
If gas is getting in the oil your oil consumption will be high, too. Keep an eye on the oil level until you get a handle on things!
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