(Models with just two speeds were tested first on low). On models with variable speeds, we blended the peanut butter first at medium speed, while agitating the contents with the tamper, for 30 seconds. For our second test, we made peanut butter in each blender with two cups of roasted, unsalted peanuts. We continued to blend the rest of the smoothie for one minute, again strained and weighed the amount of fibrous material left in the remaining smoothie, and noted the smoothie's final texture and aeration. We blended the smoothies for 15 seconds, then poured six ounces of it through a fine mesh strainer and weighed, in grams, the fibrous material that remained to gauge blending efficiency. The first was green smoothies (15 grams of 1-inch kale stems, 30 grams of kale leaves, four ounces of frozen pineapple, and eight ounces of orange juice). So, we performed two tasks with each of the blenders (including the 5200, as sort of a control).
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