The first thing you need to know about the 2010 Ford Fusion hybrid is that it’s the best mid-size hybrid sedan on the market. Yes, that’s right: it wipes the floor with the Toyota Camry hybrid.

Like the Camry, it mates a four-cylinder gasoline engine with two battery-driven electric motors and a continuously variable transmission. The Fusion has a 2.5-liter four-cylinder Atkinson-cycle engine that makes 156 hp and 136 lb-ft of torque. Although the Atkinson cycle, where the intake valve is held open longer during the intake stroke, is more efficient than the usual Otto cycle, it doesn’t produce as much power and torque. In a hybrid’s case, electric motors augment the gas engine so that acceleration isn’t compromised. Here, the hybrid system puts out a combined 191 hp.

Ford has worked hard to significantly improve the system in the Fusion over the one in the Escape hybrid. The trunk-mounted nickel-metal-hydride battery pack is smaller and lighter, for instance, and uses a different chemistry so that it doesn’t need a separate cooling system, simply drawing air in from the cabin to manage temperatures. The pack also produces 20 percent more power. Variable timing on the intake cam allows the vehicle to more seamlessly transition between electric and gas modes, according to Ford, and the Fusion can be driven up to 47 mph on electric power alone, depending on how leadfooted a driver is. Most hybrids can pull off the electric-only trick only as high as 25 mph or so.
. . .