Fuel tank capacity is either 60 l (15.85 gal) or 61 l (16.11 gal), depending on the modification.
The most fuel efficient Opel Vectra variants are 1999 Opel Vectra B CC (facelift 1999) 2.0 DI 16V, 2003 Opel Vectra C CC 1.9 CDTI, and 2004 Opel Vectra C 1.9 CDTI., with fuel consumption of 5.7 l/100 km (41.27 mpg).
The model offers a great variety of modifications, where dimensions range between 4352 and 4822 mm of length, 1706 and 1798 mm of width, and 1400 and 1500 mm of height.
According to many owners, Opel Vectra is not one of the reliable cars they’ve had and is related to many issues and visits to mechanics. Common problems include suspension issues, faulty rear wiper seal, faulty compressor, and issues with different sensors.