The data indicates that all CITROEN C4 3DR Coupe 2.0 16V 180 VTS models from 1997 are powered exclusively by petrol engines, with 100% of the vehicles in the sample using this fuel type. Additionally, the engine capacity information appears to be uniformly unavailable or not recorded for this model year, as the data shows 100% for engine capacity in 1997 without specifying a particular value. This suggests that petrol is the standard fuel choice for this model and year, and there is a lack of detailed engine capacity data in the current dataset.