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More Fuel Efficient Car Leasing Offers

posted on Oct 15 2009 by Kyle McWilton

More Fuel Efficient Car Leasing Offers

When choosing a new car leasing deal, fuel economy is a major consideration. And now the car manufacturers are going to extra effort to show you how fuel efficient their new cars are. In coming posts, we'll look at start-stop technology and alternative fuels, but for now let's concentrate on what BMW call Regeneration and what Audi call Recuperation.

Let's start with a quick physics 101. When you accelerate your new car, you create energy -- kinetic energy. Traditionally, when you brake or decelerate this energy is dissipated as heat energy. Losing energy as heat is wasteful. And it uses more fuel when your new car accelerates again. Add this to the vast array of gadgets in your car, which all need energy. A drive belt and a small generator (alternator) converts your petrol driven kinetic energy into electrical energy to power all these too.

So you can see these added energy requirements all need fuel to drive them. The new regeneration/recuperation systems reduce your car's need for fuel by recovering the energy dissipated during braking into electrical energy, which is then stored in your car's battery. The alternator (and your electrical systems) can then be powered by this stored energy. It saves fuel by reducing the alternators demand for fuel to create new energy. Here's what BMW say about their regeneration system: "By charging the battery only when your BMW is braking, coasting or decelerating, Brake Energy Regeneration improves fuel efficiency by up to three percent and ensures that the full power of your engine is available for acceleration."

Today's vehicles require much more electrical energy than older models, due to the much wider array of electric and electronic on-board comfort and safety systems. This energy is created by the generator (also known as the alternator) which converts the engine's power output into electricity. In conventional systems, the generator is permanently driven by a belt connected to the engine.

BMW's Brake Energy Regeneration operates differently: the generator is activated only when you take your foot from the accelerator or apply the brake. The kinetic energy that would otherwise go to waste is now used efficiently, converted into electricity by the generator and stored in the battery. Producing electricity in this highly efficient way delivers an additional advantage: when you apply the accelerator, the generator is deactivated - so the full power of the engine can be directed to the drive wheels.

Brake Energy Regeneration thus increases fuel efficiency while simultaneously enhancing driving dynamics. As a safety precaution, the Brake Energy Regeneration system monitors the level of battery charge and will, if necessary, continue to charge the battery even during acceleration to prevent a complete discharging of the battery. " I understand if the science can get a bit confusing. The bottom line is the energy recovery systems are designed to save you fuel and money.

Does it cost you extra to have these systems in your new car? The new 3 BMWs include this dynamic braking as standard. And when you can get a car leasing offer on a BMW 325d SE for just £299 per calendar month, it's great opportunity to get behind the wheel of a brand new, more fuel efficient car.

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