Z4 2.0 poor mpg?

[P5YNY]

Hi guys,

I'm onto my 2nd z4 2.0 (2007 m sport) - really happy with it

However, the first car seemed to do approx 34mpg in my current driving conditions (mainly short urban runs)

This car seems to only get 26 mpg ish for very similar conditions and generally seems worse mpg wise.

Perhaps it's the colder weather but seems odd. Is there anything I can look into that can affect mpg, perhaps sensors? Catalyst?

(I did have an emmissions light up for cat bank 2)

Cheers

 

[Wyldie85]

tyres inflated correctly?

Mine were down this morning by a considerable amount.

 

[paulgs1000]

Unless you're leaving it in first second and third it should be higher than that. . . .Worth having things checked - running rich?

Let us know if you do get an answer.

 

[Smartbear]

It should improve when the weather gets hotter, reset the trip comp in a couple of months time & see how it does.
Regards

 

[Geezah]

Try sticking in some injector cleaner for a few tankfuls?

 

[JINGLE]

mine usually floats around the 30 mark... 26-30 if i put my foot down and anywhere up to 40 if i do motorway miles and drive sensible(boring)

hope that helps?

2008 2.0i 55k miles with all the m sport stuff

 

[Smartbear]

Is it due a service? If it's needing new plugs/air filter etc it won't be giving its best.
Regards

 

[andysat]

What did you do when the emission light came on?

 

[obewan]

I'm getting 32mpg at the moment. Mostly short runs to work - about 7 miles each way, mostly in 40mph limit
Rises to 34+ in summer

 

[Vbstein]

I get 34+ theres something wrong with your Zed.

 

[P5YNY]

tyres inflated correctly?

Mine were down this morning by a considerable amount.

Yep all checked and inflated as per guide I read on this forum cheers

 

[P5YNY]

Try sticking in some injector cleaner for a few tankfuls?

Yep done this (redex) but only for 2 tankfulls not sure if worth carrying on?

 

[P5YNY]

mine usually floats around the 30 mark... 26-30 if i put my foot down and anywhere up to 40 if i do motorway miles and drive sensible(boring)

hope that helps?

2008 2.0i 55k miles with all the m sport stuff

Cheers that helps seems similar to mine I can get 40+ on motorway, was just sure my old one was better around town, maybe I'm just using the rev range more at the moment

 

[P5YNY]

Is it due a service? If it's needing new plugs/air filter etc it won't be giving its best.
Regards

Just had inspection 2 just before I bought it so should be good -

interestingly when I checked mot history, the dealer put it through pre purchase and it failed for emmissions, then was put in again same day and passed :s

 

[P5YNY]

What did you do when the emission light came on?

Local indie said fault was cat bank 2 and would need whole replacement cat at a cost of approx £750 for the part

I've used fault code reader to clear it for now until I decide what to do...

Not sure if this would effect mpg?

 

[P5YNY]

I'm getting 32mpg at the moment. Mostly short runs to work - about 7 miles each way, mostly in 40mph limit
Rises to 34+ in summer

Yeah pretty sure my old one sat around 32/34 mpg in urban driving - this one seems low

 

[Smartbear]

If it's still under guarantee I'd get it back to the seller if you suspect the cat :?
Regards

 

[blood_game18]

i get about 30-35mpg
i got a 2.0 2007 z4

 

[peter700]

i get about 30-35mpg
i got a 2.0 2007 z4

I'm suprised how closely the 3.0 gets to these figures, around town mine dose 27-30. As long as your not to enthusiastic with your right foot, if you are then it's been down as low as 18. But on the motorway i've hit 40 mpg a few times and it's always high 30's. Considering that's doing 70-80 ( i mean 70 ) all the way it is very impressive for such a large engine.