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MBSL65fan
And as in USA they do not pay taxes depending on engine size, and consumption was not a big problem, well... why pay more for the engine?
We do have to pay what is a gas guzzler tax which for some cars is an extra few thousand dollars. And on some cars, there are optional engine that has more liters, horsepower and torque, which can cost more.
Gas guzzler tax http://suvs.about.com/od/fueleconomy/a/jf_gasguzzler.htm