> What is the advantage of me buying leaded vs unleaded gasoline? Leaded gasoline has increased fuel efficiency, due to the higher effective octane rating. >

> What is the advantage of me buying leaded vs unleaded gasoline? Leaded gasoline has increased fuel efficiency, due to the higher effective octane rating. > Is there a suitable alternative for Ivory? (I know basically nothing about it). There's no application where ivory is required. It's purely decorative. Anywhere that you "need" ivory, you could use plastic. In most cases, you could probably also use painted/stained wood or a number of other materials.