It consumed roughtly 737,400lbs of fuel, minus the weight of the Atlas V rocket (so 500,000 lbs of fuel?) to get it in orbit. To orbit the earth at an altitude above the non-negligible atmosphere, you need to travel at around 17,000mph or more. This is roughly the same speed the Shuttle, ISS, Dragon capsule, Hubble, et all are moving. The rocket puts it in orbit at that speed. I think once in orbit, about 6 months in to it's mission, it did an orbital course correction, which if done at the correct time, requires surprisingly little fuel to do.
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