As Labor Day nears, a quiet summer seems poised to turn into an autumn to remember. Our concern here, as it has been for many years now, is the price and availability of oil products vital to our civilization. One of the many ways to think about peak oil is the point in time when our gasoline and other petroleum-fueled endeavors, such as air travel, become too expensive for casual use. As the use of petroleum products slows (US consumption is down by 4.4 percent from last year), our economy activity gradually drops to a slower pace.