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Saturn says the 2004 Vue can accelerate from 0 to 60 mph in just 7 seconds, which is pretty quick (and about 1.5 seconds quicker than the 2003 model). Yet EPA fuel economy ratings remain unchanged (19/25 mpg for the AWD V6). Variable-valve timing enhances high-end power, low-end torque and fuel economy.
The masses and Isp of each stage can be looked up on wikipedia. That means a Saturn V started in space could reach a speed of about 18 km per second or 64,500 km/h relative to its initial frame of reference. The speed of light is about 300,000 km per second, so this is still just about 0.006% of the speed of light. This speed is just the rocket without any payload.