Q. She can eat more than me but she is not as fat as I.

Anandnk, I agree with you. E is has a typo. it should be faster than me.

Second, which of these is correct

She can eat more than me.
or
She can eat more than I.

The rule that governs the choice is " When a pronoun appears at the end of a sentence which has a comaprison using the words than or as, the pronouns should be in sujective case. So the second choice above is correct.
It also be checked by verb completion as you did in you choice as ... than I am. I think that you meant B as the answer and not a. I did not type choice A.

[quote="bat_car"]Anandnk, I agree with you. E is has a typo. it should be faster than me.

Second, which of these is correct

She can eat more than me.
or
She can eat more than I.
[quote="bat_car"]

She can eat more than me is correct since objective form of I should be used here.

She can eat more than me but she is not as fat as I'am.

Wouldn't this a better way to write such a 'me' and 'I' sentence ?

Vivek.

Here is my two cents ( Adding more confusion to already confused minds, including mine)

Ans : B

She can eat more than I but she is not as fat as I.

Let us deconstruct this word;

She can eat more than I ---- (1) << main clause.
but <<conjunction.
(but) she is not as fat as I -----(2) <<subordinate clause.

Let us take (1) main clause;

She can eat more than I

she can eat 20 burgers.
I can eat 15 burgers.

She can eat [5] more [burgers] than I can eat.
She can eat more than I [can eat] << "can eat" ellipsed.

She can eat more than I

Let us take (2) subordinate clause.

She is not as fat as I

She is 120 pounds.
I am 150 pounds.

She weighs 30 pounds less than I weigh
She is less fatty than I am [fatty]
She is not as fat as I am [fat]

She is not as fat as I [am]
She is not as fat as I

Let us join these two clauses.

She eats more than I but she is not as fat as I.

I've searched the web for some good tutorial on the comparison,
but I could find a good american one.
If any one find a good web site or book that discusses this,
please let me know.

You are welcome to challenge my answering.
That is the most effective way of learning.