A truck driver needs to make a series of deliveries. He starts with a full tank of gas and drives 60 miles to the first stop, 45 miles to the second stop, and 70 miles to the final stop. The truck's fuel efficiency is 10 miles per gallon. If the truck's gas tank holds 20 gallons, how many more miles can the truck drive after completing all the deliveries without refilling the tank? Let's think step by step and output the final answer within \boxed{}.
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