@sh.add_function(dsp, outputs=['final_drive_efficiency'])
def default_final_drive_efficiency(n_wheel_drive):
"""
Returns the default final drive efficiency [-].
:param n_wheel_drive:
Number of wheel drive [-].
:type n_wheel_drive: int
:return:
Final drive efficiency [-].
:rtype: float
"""
from asteval import Interpreter as Interp
formula = dfl.functions.default_final_drive_efficiency.formula
return Interp(dict(n_wheel_drive=n_wheel_drive)).eval(formula)