A loaded semi-truck consumes about 10 US gallons of diesel per hour (assuming an average speed of 60 mph) and is driven about 16 hours per day, every day of the year. The density of diesel is 0.85 kg/liter. If 1 barrel of crude oil produces 10 US gallons of diesel fuel. How many semi-trucks could run on the crude oil produced in the US in one year (1.8x10^9 barrels)?

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