Today's technology allows manufacturers to make small cars more fuel-efficient now than at any time in their production history.
small cars more fuel-efficient now than at any time in their
small cars that are more fuel-efficient than they were at any time in their
small cars that are more fuel-efficient than those at any other time in
more fuel-efficient small cars than those at any other time in their
more fuel-efficient small cars now than at any time in
Answer A suggests that the manufacturers are making small cars efficient, i.e. they're changing small cars, but in fact they're making small cars that are efficient.
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