When I was trying to figure out the calorie content of avocado eel rolls, I did a google search for "sushi nutrition" and found a few sites that had estimates - such as sushifaq and dietfaqs. The estimates I've seen for 6 pieces of eel avocado roll around around 372 calories and for 6 pieces of avocado roll around 140 calories. What I tend to do for things like this is to find several estimates and average them.
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