Ask AP: Leaded gas and college football poll votes

Lead additives can be mixed with unleaded gas to fuel cars designed for leaded gas, but the additives are only intended for off-road use, at least in the U.S.

John Wilen

AP Energy and Transportation Writer, New York

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The world appears to have an insatiable thirst for oil. Millions of barrels of oil are pumped from the Earth each day, but does anyone know the "replenishment" rate? Is the prospect of depleting all the Earth's oil a legitimate concern, or is new oil being created at a rate which will sustain us "forever"?

Gary Wagner

Morton, Ill.

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Oil is a finite resource and eventually there will be a point where reservoirs are depleted and new ones become more and more difficult to locate and develop.

The International Energy Agency estimates the world has 7 trillion barrels of conventional oil, of which 3.3 trillion barrels are technically recoverable. It projects global need between now and 2030 will total 1 trillion, about as much oil as already has been pumped.