About how little oil can I add to an amount of flour to make a dough that is one lump of one consistency, not crumbly and in pieces? I'm looking for a ratio of solid to liquid. If it matters what kinds of flour and oil, let's say olive oil and white wheat all-purpose flour.
This is actually not answerable as an absolute. One of the Great Unknowns when baking with flour is how humid it has been in your flour storage recently, and thus how much water is already in the flour. I've had a few cups of flour require as much as half a cup extra water to get the right consistency depending on the season.