According to Mercedes, the new powerplant provides the G63 with enough firepower to blast from zero to 60 mph in 4.4 seconds—the last G63 we tested needed 4.8 seconds to hit the same mark. Top speed is said to be 137 mph, although opting for the available AMG Driver’s package ups that mark to 149 mph. Either figure bests the old model’s 130-mph top speed.
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