Do most American's have an Amazon delivery every other day? It's not what it feels like where I live, but I might live in a part of the country unusually avoiding Amazon. While I see an Amazon truck every day, they visit 1-2 houses around me out of hundreds.
If feels like there are Amazon households that get a delivery every or every other day and non-Amazon households that order 1-5 times a year (if that) and batch their purchases from other retailers (physical or online). That's the genius of Amazon. Those that use them, use them a lot.
That's not the real question.... The real question is "On my block, what is the probability of any given house having at least one delivery on any given day"
I can say for certainty that Amazon delivers to my block every day. Adding 1 extra package is definitely more energy saving than me driving to Costco for the same thing.