Since hybrids cost more than "normal" cars with traditional gasoline engines, there's a hybrid price penalty that you should consider. In some cases this premium can be a few thousand dollars, but in others the price can be much higher. For example, the Nissan Altima hybrid and the normal Nissan Hybrid have a price difference of $6880. This means that, with gas currently at 2.64, you'd need to drive it for 22 years (we're not kidding) at a pace of 15,000 miles/year before you started recouping the cost benefit of the fuel mileage increase. Of course, if gas keeps edging up toward (and past) $4.00/gallon, your ability to recoup these costs is closer within reach.
The reality is that it's much more effective from an environmental perspective if you trade up from a low-mileage car or truck or SUV to a hybrid than, say, moving from a normal sedan to hybrid. In part this is due to the law of small numbers: it's much easier to "double" your mileage when you start with something that gets only 12-15 MPG. If you're currently driving a sedan that gets about 30 mpg on the highway and 25 mpg in the city, there are few hybrid vehicles that will allow you to make a leap to double your mileage.
Lesson learned: Hybrids give drivers significant fuel-saving benefits, but the real differences are found when someone trades up from a gas guzzler.
Hybrids find a lot of fuel and C02 savings in the city, where they can take advantage of their stop-start systems at stop lights and also run the vehicle under pure electric power for blocks at a time. If you're a highway driver, that same hybrid will more or less act like a regular old traditional car if you're hauling down an interstate for the majority of your commute. The Toyota Prius, for example, has better fuel economy within the city than on the highway.
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