To be technical, yes. However, when you draw more current from a lead-acid battery, it's voltage drops. This is an indirect and easy way to compare one setting against another. I don't know how much current it's drawing. I do know that the fan on setting 3 draws more than on setting 2. That's my point, that there is a difference.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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