what is the brand of the "Octane Booster" that you are using, and how much do you normally add to a tank of fuel?
how many miles did each of those 2 tanks of fuel deliver?
when you "cleaned the carburetor" did you clean and tighten the jets properly? did you pinch, cut or rip any of the seals? or did you adjust the float level or change it in any way, like putting the needle back wrong?
is the "normal gas" you use, regular grade, 87 octane, but still has the 10% ethanol content?
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