You did not specify what units those numbers are describing, but I'll assume you meant inches, seeing as a trash can that is 20 cm high would be quite small, and one that is 20 ft. or 20 m high would be excessively large.
Your trash can is 20*20*30= 12,000 cubic inches. A gallon is 231 cubic inches, so your trash can would hold 12,000/231= 51.948 gallons.
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That depends a great deal on your gas mileage. If you get 30 mpg, you'll need 22 gallons. If you get 20 mpg, you'll need 33 gallons.
It depends on your gas mileage. If you get 30 mpg, you'll need 83 and 1/3 gallons. If you get 20 mpg, you'll need 125 gallons.
If you get 30 mpg, 510 miles. If you get 20 mpg, 340 miles.
About 30 US gallons.