Sentence Correction (SC) | Diesel engines burn as much as 30% less fuel than gasoline engines of

Choice A (the OA) is objectively poor construction, because of the phrase "as well as requiring" and its complete lack of parallel structure. However, GMAC says it's the answer, so we have no choice but to learn from that.

"The GMATis a challenging test, as well asrequiring the student to pay a $250 examfee." is not an English sentence that one should ever speak or write in real life...but it's permissible, according to GMAC.

The only real takeaways from this highly
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