I certainly would not consider a gallon per 1000 miles to be alarming. When I fill my oil to the full mark, I probably use 1 gallon per 1000 miles. When I keep it one to two quarts low, I cut that by about a third or more. It should say something that Newell installed a 4+ gallon supplemental oil reservoir.
When I blew the gasket between the head and the blower, I was losing about a gallon of oil every 60 miles. Now that is excessive.
As long as the two oils are the same weight and both meets the CF-2 standard, I would not be concerned about mixing brands. As they say, a two-stroke is constantly changing its own oil.
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