Back in June, I pumped gas for $4.50 a gallon while in California. Recently, I filled up for $1.60 a gallon around here. Adjusted for inflation, a gallon of gas costs about what it did in the 1950s. The last time prices fell after a steady increase, Americans rushed out and bought SUVs, vans and trucks. Will we be smarter this time? We can wait for the economy to rebound to find out, or we can take action now to permanently loosen the grip of oil dependence.