The data indicates that the majority of the Mercedes-Benz E-Class (2002-06) E320 4DR Saloon 3.2i V6 Elegance Auto vehicles are equipped with a 3.2-liter (3199cc) petrol engine, accounting for approximately 98.6% of the vehicles. A small minority, about 1.4%, feature a Gas Bi-fuel configuration with a slightly larger engine capacity of 3.498 liters. This suggests that the standard and most common specification for this model is the petrol version, with very few vehicles utilizing alternative fuel options.