To clarify, the AWD cars with low displacement (see: Toyota Matrix, Suzuki SX4) are significantly smaller and lighter than the larger displacmeent ones (Subarus, small SUVs). Not apples-to-apples. Assuming that the highest fuel economy from an AWD car happens to be the smallest displacement, it still does not prove that smaller engines are, by default, more efficient.
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FWD is the new AWD
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