Anyone got high fuel consumption problems with their STX550?
I am totally dissatisfied with the fuel economy of our STX550. I have reported this on several occasions to the servicing dealer when the vehicle has been in for a service. The service people advised the fuel pump had been through a “relearn’ process. There was no noticeable difference. When I was in Queensland I had a dealer service the vehicle and asked if he could check the fuel pump for the “relearn” process as the fuel economy is poor. He advised that there is no such process for the STX550 fuel pump, so I am confused as to who is right, nevertheless the fuel usage is lousy. When towing the fuel usage can average high as 25 litres per 100 Kilometres. Towing the same caravan with 3 litre BMW fuel usage can average high as 15 litres per 100 Kilometres but is generally between 12 & 14 litres per 100 Kilometres and with a 3 litre Patrol fuel usage can average high as 14 litres per 100 Kilometres but is generally around 12 litres per 100 Kilometres. As I live in the country most of the driving is Highway environment as opposed to city stop start driving so I would expect to see fuel usage equal to or better that the proclaimed 9.3 litres per 100 Kilometres combined highway city cycle, but is generally between 12.8 and 15.4 per 100 Kilometres. A noticeable defect is the extraordinary amount of black and light blue/grey exhaust smoke emitted when the vehicle is first started and when accelerating or under load. Paul Glover, the motor writer, has stated that there are some sensors on the STX550 that can fail causing excessive fuel use. The service people take the vehicle for a 25 kilometre cruse up the freeway and advise that the fuel usage is within “Nissans average fuel usage for this vehicle”. Indeed 3 out of 5 times I can get 9.8, 10.1 and 9.9 per 100 Kilometres but over the life of a tank it does not make it. Any ideas?
I am totally dissatisfied with the fuel economy of our STX550. I have reported this on several occasions to the servicing dealer when the vehicle has been in for a service. The service people advised the fuel pump had been through a “relearn’ process. There was no noticeable difference. When I was in Queensland I had a dealer service the vehicle and asked if he could check the fuel pump for the “relearn” process as the fuel economy is poor. He advised that there is no such process for the STX550 fuel pump, so I am confused as to who is right, nevertheless the fuel usage is lousy. When towing the fuel usage can average high as 25 litres per 100 Kilometres. Towing the same caravan with 3 litre BMW fuel usage can average high as 15 litres per 100 Kilometres but is generally between 12 & 14 litres per 100 Kilometres and with a 3 litre Patrol fuel usage can average high as 14 litres per 100 Kilometres but is generally around 12 litres per 100 Kilometres. As I live in the country most of the driving is Highway environment as opposed to city stop start driving so I would expect to see fuel usage equal to or better that the proclaimed 9.3 litres per 100 Kilometres combined highway city cycle, but is generally between 12.8 and 15.4 per 100 Kilometres. A noticeable defect is the extraordinary amount of black and light blue/grey exhaust smoke emitted when the vehicle is first started and when accelerating or under load. Paul Glover, the motor writer, has stated that there are some sensors on the STX550 that can fail causing excessive fuel use. The service people take the vehicle for a 25 kilometre cruse up the freeway and advise that the fuel usage is within “Nissans average fuel usage for this vehicle”. Indeed 3 out of 5 times I can get 9.8, 10.1 and 9.9 per 100 Kilometres but over the life of a tank it does not make it. Any ideas?