<i>Something like holding gas at $2&#x2F;gallon - if it goes up, then the extra tax ends.</i><p>It&#x27;s an interesting idea, but I think it would cause havoc with gov&#x27;t budgets.  Could you imagine if oil prices went up and suddenly that $0.50&#x2F;gal tax disappeared overnight?<p>It seems like gov&#x27;ts in oil producing countries have a hard enough time budgeting based on the oil royalties they receive.  I know Alberta, Canada has gotten hammered again and again when they assumed royalty revenue would stay high and it dropped like a rock.