But above those speeds, the diesel's throttle response becomes deeply measured and wafting, never punchy nor particularly fun.

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The driver-selectable Eco mode softens the throttle response and giving more authority to the EV side of the powertrain.

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Sport mode allows for quicker starts, livelier throttle response and greater passing power.

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Its throttle response and dashing good looks earned high marks, but the range anxiety left a bit to be desired.

ENGADGET

Throttle response is good at any speed -- any speed under 50.

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The software upgrade turns up the throttle response to 11 and so, if you bury your foot, the car will take a deep breath and then lunge forward (and a little sideways) on gusts of turbo boost and a blizzard of revs.

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