By calling it a “modest proposal” are you comparing this idea to Jonathan Swift’s “A Modest Proposal”? If so, you should consider that Swift was using satire. He didn’t really think the English landlords should eat Irish babies. He was simply trying to demonstrate that if the English landlords were going to continue to expliot the Irish, they were just as guilty as if they had eaten babies.
So if you are simply trying to stir up discussion on ways to conserve oil, OK. If you really think that any elected official has a chance of enacting your idea, you should open a window in the shop. You have obviously been breathing too much car exhaust.