Yeah because it would be a great idea to take a car like that at high speed

Look at the proportions and aerodynamics of that vehicle, there is more than one reason it isn't given high power numbers.

Wheelbase 73.5 inches
Track width front/rear 50.51 inches/54.53 inches
Length 106.1 inches
Width 61.38 inches
Height 60.71 inches


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X5 for example in contrast:

Wheelbase 115 inches
Length 191 inches
Height 69 inches
Width 76 inches


The smart car is a driving brick.

Smart cars are limited to 90mph for a reason It would be an out of control death trap in triple digits without substantial suspension modification, just look at the height of the vehicle as opposed to is wheelbase and size.

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