Pledge to Hedge: A High-Tech Way to Boost Your Vehicle’s Gas Mileage

begin today with a startling number: 5.2. That’s the percentage my gas mileage improved when I added Pulstar Pulse Spark Plugs to my 1991 Mazda Miata. Made by the Albuquerque, N.M.-based Enerpulse Inc., Pulstar Plugs are the latest in a series of innovative new products…