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consider the weight to frontal area ratio of a transport truck to a 3000 pound car. 25x the weight with maybe 8x the frontal area. Their total air drag-to-weight ratio is much smaller. That same truck gets approx the same milage when it is dead empty, too (may save 1mpg if LUCKY). This reduces the weight/FE ratio greatly.... lots of reasons, really. Most prominant probably being that weight has a much smaller affect on FE than you'd think.
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