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805+ Level|   Evaluate Argument|   Weaken|      
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AnirudhaS
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Ethanol, a fuel derived from corn, can be used alone to power cars 26 Mar 2022, 12:15
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MartyTargetTestPrep
AnirudhaS
(C) Whether ethanol is as efficient a fuel as gasoline

I don't understand why C cannot be the answer.
Why would we want to research if its more efficient or not.
We know that ethanol is cleaner than gasoline and can be easily produced.
So even if its not as efficient, since its better for the environment we need to use it.
Hi AnirudhaS.

Notice that, if ethanol is less efficient than gasoline, then we may have to burn much more ethanol than gasoline to generate the same amount of energy.

If so, it may be that, even though ethanol burns cleaner than gasoline, we would have have to burn so much more ethanol than gasoline that we would end up generating more pollution by using ethanol than we'd generate by using gasoline.

So, (C) whether ethanol is as efficient a fuel as gasoline is something that would be important to research.
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Thanks Marty, this was a tough one!
I thought "ethanol used in conjunction with gasoline" meant ethanol mixed with gasoline is served at the petrol pumps. This is actually happening right now and is known as E10.
But I think what the author here says is complete substitution of gasoline with ethanol, or some cars use ethanol and some use gasoline.
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Ethanol, a fuel derived from corn, can be used alone to power cars 26 Mar 2022, 14:21
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AnirudhaS
MartyTargetTestPrep
AnirudhaS
(C) Whether ethanol is as efficient a fuel as gasoline

I don't understand why C cannot be the answer.
Why would we want to research if its more efficient or not.
We know that ethanol is cleaner than gasoline and can be easily produced.
So even if its not as efficient, since its better for the environment we need to use it.
Hi AnirudhaS.

Notice that, if ethanol is less efficient than gasoline, then we may have to burn much more ethanol than gasoline to generate the same amount of energy.

If so, it may be that, even though ethanol burns cleaner than gasoline, we would have have to burn so much more ethanol than gasoline that we would end up generating more pollution by using ethanol than we'd generate by using gasoline.

So, (C) whether ethanol is as efficient a fuel as gasoline is something that would be important to research.
Thanks Marty, this was a tough one!
I thought "ethanol used in conjunction with gasoline" meant ethanol mixed with gasoline is served at the petrol pumps. This is actually happening right now and is known as E10.
But I think what the author here says is complete substitution of gasoline with ethanol, or some cars use ethanol and some use gasoline.
Show more
In either case, if you didn't know how "efficient" ethanol is, you would want to know before you decide that, by using it to any degree, you'd reduce pollution.
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Ethanol, a fuel derived from corn, can be used alone to power cars 23 Aug 2025, 20:44
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