First, we determine how much sugar Lisa uses per fluid ounce of sweet tea. She uses 5 grams of sugar for 8 fluid ounces. To find the amount of sugar per fluid ounce, we calculate:
\[ \text{Sugar per fluid ounce} = \frac{5 \text{ grams}}{8 \text{ fluid ounces}} = 0.625 \text{ grams per fluid ounce} \]
Next, we find out how much sugar she would need for 256 fluid ounces of sweet tea. We can do this by multiplying the amount of sugar per fluid ounce by the total number of fluid ounces:
\[ \text{Total sugar for 256 fluid ounces} = 0.625 \text{ grams/fluid ounce} \times 256 \text{ fluid ounces} \]
Calculating this gives:
\[ 0.625 \times 256 = 160 \text{ grams} \]
Thus, Lisa used 160 grams of sugar to make sweet tea last week.
\[ \text{Final answer: } 160 \text{ grams} \]
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