What Is The Most Environmentally Friendly Car That You Can Buy?

One car in the top category is the Honda Civic 1.3 IMA Executive. This is an ordinary looking car with good styling that has a hidden environmentally friendly feature. It has a hybrid engine. There is a normal petrol engine that runs on unleaded petrol and it has the usual latest catalytic converter and low emission system. However, it has an extra electric motor that engages when going up hill to save on petrol consumption.

Normally the car runs on petrol but the electricity from the motor is used when you would normally have to rev more to get the power you want when accelerating or travelling up hill. The motor is powered internally – it recharges from the energy produced by going downhill and braking.

Because of the engine system, it does has some fairly unusual parts but the makers, Honda, have guaranteed them for life, so they can be replaced free of charge if they do degenerate.

The most energy efficient car you can get is keeping your old car or buying a second hand one if your car really has reached the end of its life.
The energy savings achieved by the lower fuel emissions of a new car pail into insignificance compared to the amount of fuel used in the manufacture of new cars.
Hybrids are actually among the worst cars to buy in terms of total lifespan emissions. The amount of energy used in the manufacture of  the complex parts inside the car and the energy used to transport them here all the way from Japan neglate any future CO2 savings. They also have the disadvantage of using batteries that are really bad for the environment and need to be replaced every 3 years and are completely unrecyclable.
So in short don't replace your car unless you actually have to and then make sure to buy second-hand.