Bought £10k car with smoke from exhaust and poor MPG

System

It might just be all the crap in the exhaust which was put in there from the previous knackered engine burning off. Did you tell the RAC it had just had a replacement engine? If not then I suspect if you do they'll say the same thing.

Keep an eye on your oil and coolant levels. As long as they don't change and you're not getting emulsified oil then all is good and its just burning off residual crap in the exhaust.

As for the MPG, with a small sized turbocharged engine you can either have performance or economy but not both. If you want the economy then you need to accelerate slower and spend more time on journeys maintaining your speed because the more you use the turbo to accelerate faster the more fuel it'll use.

Also your driving style, how you approach things like roundabouts, junctions and traffic lights or how you leave a motorway can affect how much fuel you use. If you're someone who approaches a roundabout and keeps on the accelerator until you get to the point you have to use the brakes to stop you'll use more fuel than someone who lifts off the accelerator much further back than when you use the brakes and they use engine braking to slow down.

Borgy

You see the strange thing before it had a new engine, if I drive 5 mins you get the condensation but if after 1hr driving it stops, but if engine is off only for 5 mins and start again the condensation was back.
I drive in normal mode, sports mode is better but I know will use more fuel.

The car looks great, and drives really nice with all the gadgets and now with a new engine and full warranty from Nissan for car for another year.

I am looking at the oil and water levels and look fine at min, but problem is I use it for maybe 50 miles per week only.

forgotmyname

Your not driving it the way they did when they wrote the book.

The figures for my car says 42mpg, yet measured over a full tank i have had 28mpg several times and 57mpg several times. Which is right.

Both of them it depends on your journeys and driving style.

Norman_Castle

Borgy wrote: »

problem is I use it for maybe 50 miles per week only.

For 50 miles per week buy a V8 or straight six. Pointless buying an efficient car for near zero mileage.

Borgy

Ok, so I have had now 3 full tank of fuel since I bought the car, I did drive 300 miles to test the car due to issues to prove the point, but Never had more than 30mpg, as said before using normal mode, with motorway use, and never putting my foot down, with top marks on the driving efficentcy tracking in the car.
The car was bought not for it's fuel performance but as it has a Turbo charger and is quite quick for it's size, but with a modern engine one would expect better than 30 mpg on average.

Btw Nissan in Wigan told me 35 to 40mpg is normal.

I would say this is based on the cars data which was reset last time, full tank of fuel with 220 miles to empty, which means could not get to London on a full tank of fuel, but when software was reset the car shown 280 miles to empty. Will start to check miles driven per full tank next and see if it equals to the cars data.

Other issue I have with the car, the line change over warning system using the cameras, if you was on the motorway and moved across lines the system will warn you with a low audible bleep, thought this sound could be made higher, or like on some cars shake the steering wheel with sound, but it should give you a warning that alerts you, if you have music playing low you can only just hear it, why not turn off the music if activated like a telephone call would do.

forgotmyname

35 - 40mpg maybe normal. But define normal driving styles and conditions?

Are you only using the trip computer to obtain the figures? How accurate is that?

Mines averaged everything from 28mpg to 57mpg measured properly over a full tank. And as high as 62.8 on a single journey.

Smoke = condesnation. Look at all the water dripping out. Too many short journeys.