What is the actual fuel consumption of the old BMW 745?
2 Answers
The average fuel consumption of the BMW 745 is 14.4 liters per 100 kilometers, but fuel consumption is related to many factors, so the specific actual fuel consumption should be based on actual usage. The main factors affecting fuel consumption are as follows: 1. Vehicle-related reasons: As an internal control unit of the car, the oxygen sensor mainly monitors the fuel-air ratio of the engine. Once it is damaged, it will cause an imbalance in the fuel-air ratio, and fuel consumption will definitely increase suddenly. After the oxygen sensor is damaged, the exhaust pipe will emit darker-colored exhaust gas while the vehicle is in motion. Solution: Replace the oxygen sensor at an authorized 4S shop. Some car owners may try to save money by repairing it at a roadside stall, but after replacement, it must be tested again with a detector after the car is warmed up (the oxygen sensor works at high temperatures) to ensure there is a fluctuating signal output, which indicates a genuine part. Because when the vehicle is not running, the oxygen sensor does not function, and even if a fake part is installed, it cannot be directly read from the instrument panel. 2. The 'three filters' have not been replaced for a long time: During vehicle use, the three filters (oil filter, air filter, and fuel filter) must be replaced regularly. If they are not replaced for a long time, they will become dirty and affect performance, sending incorrect information to the engine control unit, resulting in incomplete fuel combustion and increased engine carbon deposits. Solution: Regularly maintain the vehicle and replace the 'three filters' based on the mileage driven.
I drove an old BMW 745 for several years, and the fuel consumption was really high. In city traffic jams, the display easily showed 18-20 liters per 100 kilometers, while cruising at 120 km/h on the highway was around 12-14 liters. The most extreme was when climbing hills with the AC on, instantly hitting 25 liters. The 80-liter fuel tank is quite large, but a full tank in the city wouldn’t last 400 kilometers before needing a refill. Honestly, older V8 engines with large displacements are all like this—tire pressure, carbon buildup, and air filter condition all affect fuel consumption. A friend’s poorly maintained car burned 3 liters more under the same conditions, so regular spark plug replacements and throttle cleaning can actually save some money. With fuel prices high now, I have to think twice before taking it out.
