I had been quick to run out of olive oil after delving into SK's latest brownie recipe, prompting me to append the item to the grocery list. Alas, the market value of olive oil was shocking: $17.99 for a bottle just $6.99 at the start of 2020! The newly-discovered information caused me to execute a second batch with vegetable oil swapped for olive, less for flavour but purely on the bases of economics and convenience.
Nevertheless, one cannot deny the moistness that comes with oil-based brownies - they are soft and enjoyable for days after (and even gooey past the third day!), unlike the dry, cakey specimens of butter-based formulas. There are, regrettably, some repercussions of satiation, however, for, while oil improves tenderness, it does not keep fullness at bay.