Same.

Would Mangio molto in generale translate to "I eat a lot in general" or would you still say "In generale mangio molto"?

why "I usually eat a lot" is not accepted ? aren't "usually" and "in general" the same ?

Isn't 'in generale' an adverb here?

I answered 'I eat a lot in general', which seemed to be a wrong answer.

What about "I eat a lot as a rule"?

On normal speed, I hear an indeterminate "mangio/mangia". It's only on slow speed I hear "mangio". Reporting it.

I would never say "I usually eat much" in English! Bit of an odd translation...

That's why they call me Grocery Boy.