poor fuel consumption

[idan barel]

i have a 2011 156 thp automatic rcz and i barely get 400-450 km per tank, avg 8km per liter...
what could be the problem?

 

[tianorth]

Automatics are usually thirstier than manual gearboxes.
The colder weather also doesn't help with consumption.

My diesel in the past could get up to 1000 miles on a tank (1600km), but last fillup with 54 litres got less than 600 miles (1000km).
It's just the time of year, there is more usage of electrical equipment ie the blower is on to defrost the car, the heated rear screen is on, the headlights are on, the heated seats etc all these in themselves increase fuel consumption but added to get her is a real drain on the battery and the engine is colder so takes longer to get to temperature, the alternator is working harder to replace power used, which makes the engine work harder and more fuel is used.

Putting a better grade fuel in may help if not already doing eg Shell V-Power Nitro, BP Ultimate etc.
These burn more completely as they are also at a higher octane (may also give better km/l and better acceleration).
More power, bigger explosions more heat etc engine warms up a little quicker.

I don't think it's anything you or the car are doing wrong, just the time of year.

 

[tianorth]

Don't forget to pop over to the introductions and introduce yourself.

We are a friendly bunch, willing to help whenever we can.
There are also meets, so might be able to meet up with like minded people etc.

 

[idan barel]

thanks for the quick reply, could it be that the recomended tyre pressure on 235/45/18R is 29 front 33 rear?

 

[drdino]

What's your typical drive like?

 

[idan barel]

56 km to work and back 4 times a week, mostly outside of the city, usually drive in a speed of 120-140 kmh.

 

[tianorth]

thanks for the quick reply, could it be that the recomended tyre pressure on 235/45/18R is 29 front 33 rear?

The pressures are on a plate on the door aperture on the left side of the car.