motor vehicle depreciation operation, represent, tangible, assets, normal

prav_Cfa7

hey guys
im confused about the depreication of tangible assets, particiularly motor vehicle, under IFRS
if a compnay normally depreciates a vehicle using straight-line basis, but the vehicle was used only 30% compared to its normal operation, then can we only depreciate it 30% to accurately represent the usage?
or do we still have to use 100% since we've been consistently doing that?
thank you guys!!