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

More than 80% time and also is wrong in GMAT for redundancy.

So eliminate C, D

eliminate E for double progressive sense...emitting....and other gases having

I chose B for parallelism burn as much as ....as well as emit...though it has awkward having...

OA is A ...

why plz explain...

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