Ford Motor Co. has unveiled a new engine technology with the unsubtle name of EcoBoost. Ford folks say the engine, which comes in both four-cylinder and six-cylinder, will deliver up to 20 percent better fuel economy, reduce CO2 emissions by 15 percent, pay for itself in fuel savings in less than three years, and, of course, not compromise driving performance. The company hopes to have EcoBoost engines in 500,000 vehicles a year by 2013 — and it wouldn’t mind regaining that No. 2 automaker spot by that time either.