Suzuki Swift Sport 2006 MPG

[TotalFinlay]

Hi all,
My Swift sport (recent purchase) is on the dash displaying about 19 mpg avarage,
Feels like there must be something wrong as it's a 2006 1.6 ,
I only get around 30 mpg when cruising at 30 mph in fifth gear ! I'd expect at least 40 from that,
On normal use around manchester it's only getting around 20/25 mpg ??!

Cheers

[mike9009]

A few questions

1. Have you measured the actual mpg by doing a full tank to full tank measurement rather than going off the computer?
2. At 30mph you are maybe straining the engine in 5th gear. Thus when you need to speed up a little you are using more fuel as the engine is strained whilst you are trying to accelerate?
3. What mpg do you get at 70mph on a run?
4. Are you looking at an average mpg or the instant mpg on the computer?
5. Are you doing lots of short, town type driving journeys?


Around town my car will get sub 20mpg, on a run I get 40+ mpg. If I am looking at the current mpg setting mine can go down to 7mpg (or less ) - over an average tank I generally get 33mpg - which seems normal for a 3.0L petrol car like mine..

Mike

[TotalFinlay]

Yes I've done tank measurement it correlates well with the dash reading, also driving in fifth gear compared to the others does produce a higher mpg with this car, but even on the motorway I'm not getting very good mpg, maybe 30/35 at best ?

[GroundEffect]

If anything was wrong causing overfueling it should be flagging a MIL. Does the MIL (engine light) light up with just ignition on and go out after starting? You might want to get the Lambda/MAF sensors checked.

[Ron99]

Probably one or more cylinders not firing properly.
Swift Sports consume more than their fair share of coil packs.

[TotalFinlay]

Nah no check engine lights !
Anyway I can test the coil packs myself ? I presume I'd need an emissions tester to test the lambda sensors ?
Only other thing is it's taking a bit longer to start up then usual, the other day I had to try twice !

[GreenV8S]

Ron99 said:

Probably one or more cylinders not firing properly.

Wouldn't you expect to feel the engine roughness and see emissions fault codes?

[Ilovejapcrap]

mines a 2016 so 6 speed box and i get 35 mpg average and i thrash it, just for info.

35 mpg at 70 even in a 5 speed sounds low for these !!

[TotalFinlay]

Precisely! There's definitely something going on causing it to have such bad mpg and yeah the throttle seems smooth so I'm fairly sure it's firing on all 4

[GreenV8S]

As a sanity check, are the average fuel consumption figures you're seeing on the dash consistent with the amount of fuel you're putting in?

[TotalFinlay]

^^^ yeah they are very consistent ! I mean I can get used to an avarage around the city of 25 mpg despite that being quite obviously low, but to only get at best 35 on the highway tells me there's something going on !

[GreenV8S]

Have you got the recommended size tyres at the recommended pressures?

[TotalFinlay]

Yes stock wheels good tyres and perfect pressures !

[GreenV8S]

Any wheels getting hot in normal driving? That might indicate a dragging brake.

Edited by GreenV8S on Monday 14th January 13:05