Well, the secret's out. Here's our opinion on how to get more miles per gallon:

"Engine and vehicle technologies have improved steadily in the past 20 years, and vehicles have become more efficient. But without either a push from CAFE standards or a pull from soaring fuel prices, the higher efficiencies are routinely offset by the increasing size, weight, speed, and performance of many vehicles.

"The unsettling result is that in the last 20 years the average fuel consumption in new vehicles has not changed.

"But there are ways to lower the cost and the burden of relying solely on regulation. Measures that could stimulate consumer desires for fuel economy would ease both the costs and uncertainty borne by manufacturers."

(P.S. Not that it was a secret or anything.)