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true 4WD is used in trucks or some cars (i.e. jeep) having off-road capability. The power drives all four wheels (this is why called 4x4) and in addition, the rear differential can also be locked to increase the traction. The crawling ratio is (rotation of engine/ration of wheel) high and the car can go some area where most sedans can't even try to. That is why it is usually off EPA. Nowaday, some SUV provides the switch to turn on/off 4wd feature for saving gas. At the 4wd is off, it works like a rwd car (i.e. pathfinder or 4running).3 s) ]0 @: @ N/ z
6 w8 C( P* O! l4 hAWD is designed to balance the power among four wheels. in good road condition, it is like FWD car. If any front wheel is slippery, the power is sent to the rear wheels. Thus, it saves gas and yet gives the car more capability to handle the imperfect road condition.8 t4 e1 ^+ E0 l) a( e
2 c6 U; D; q9 W% @in short, if you wanted to go off-road, take 4wd car. Otherwise, awd fits your business quite well. |
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