very very bad mpg

**leet5r** · Thursday 25th February 2010, 20:09

what can cause bad mpg appart from my driven , cheers

**t5_monkey** · Thursday 25th February 2010, 20:11

there seems to be a few posts up about bag MPG at the moment - maybe the weather isn't helping?

**leet5r** · Thursday 25th February 2010, 20:14

yeah .but does bad weather cause it to go to around the 15 mark in town

**Hallsy** · Thursday 25th February 2010, 20:26

I wouldn't say 15mpg is very, very bad for town driving, unless it is mixed.

Mine is averaging 24.5mpg with relatively short journeys, but no town driving (stop/starting), and is an auto on 215k.

**LiamT4** · Thursday 25th February 2010, 20:58

I know this might sound daft, but have you checked the tyre pressures, do you have your A/C on all the time, heated window/seats etc. But 15mpg around town don't seem to bad, mines prob around that mark in town, i'm getting 22.4mpg at the min, a mixture of driving.

**nobananas** · Thursday 25th February 2010, 20:58

Ask a local garage to do an emissions test at various different constant rpm's and at idle. Might be that your Lambda sensors up the stick and causing it to over-fuel, an emissions test would show if there is any over-fueling issues.

**p fandango** · Thursday 25th February 2010, 21:22

have you checked for any air leaks recently mate?

**siamblue** · Thursday 25th February 2010, 22:03

My auto V70R AWD used to get 16 around town,

Gary

**cameron** · Friday 26th February 2010, 22:18

My HLM'd T5 is doin about 17.9 around town at the mo and its an auto

**p fandango** · Friday 26th February 2010, 22:19

Originally Posted by cameron

and its an auto

you can't have everything mate

**Flatout Phil** · Friday 26th February 2010, 23:07

Originally Posted by leet5r

yeah .but does bad weather cause it to go to around the 15 mark in town

That sounds quite acceptable - nature of the beast. But when you consider that, as I followed a flat-out 350Z up a long motorway slip road today and there was absolutely nothing in it, it ain't a bad compromise on the pounds for poke. My R averages 15mpg, the T5 17.5mpg and the old 2.5 20v GLE about 20 I seem to recall.
These are motorway cars and as such, on a long level cruise at 55-60 I can get toward 40mpg. But not much fun.

**WOODY T5** · Friday 26th February 2010, 23:15

my mte'd t5 doing 23.4 around town its manual

**leet5r** · Friday 26th February 2010, 23:38

so i guess its about right then lol

**t5_monkey** · Friday 26th February 2010, 23:38

Originally Posted by Flatout Phil

That sounds quite acceptable - nature of the beast. But when you consider that, as I followed a flat-out 350Z up a long motorway slip road today and there was absolutely nothing in it, it ain't a bad compromise on the pounds for poke. My R averages 15mpg, the T5 17.5mpg and the old 2.5 20v GLE about 20 I seem to recall.
These are motorway cars and as such, on a long level cruise at 55-60 I can get toward 40mpg. But not much fun.

350Z's don't seem that quick unless the driver is spanking the nuts off it - I had one try to overtake me coming out of a village 30 limit, he got alongside but then what can i say - epic Fail

he ended up about 3 car lengths behind - Wonder what MPG they get tho??

**p fandango** · Saturday 27th February 2010, 06:38

Originally Posted by Flatout Phil

That sounds quite acceptable - nature of the beast. But when you consider that, as I followed a flat-out 350Z up a long motorway slip road today and there was absolutely nothing in it, it ain't a bad compromise on the pounds for poke.

Originally Posted by t5_monkey

350Z's don't seem that quick unless the driver is spanking the nuts off it - I had one try to overtake me coming out of a village 30 limit, he got alongside but then what can i say - epic Fail

he ended up about 3 car lengths behind - Wonder what MPG they get tho??

not many people know the 350Z uses an updated version of the old Volvo/Renault V6 that was used in the 240/760 & 960. When you think Volvo stopped using the engine in 1991 no wonder they struggle with it lol

be good to do a 350Z engine transplant back into a Volvo tho

**PNuT** · Saturday 27th February 2010, 10:56

Originally Posted by leet5r

what can cause bad mpg appart from my driven , cheers

is it getting up to temprature & staying there?

**danny-R** · Saturday 27th February 2010, 11:27

Originally Posted by PNuT

is it getting up to temprature & staying there?

if not, does that mean coolant temp sensor or themostat??

ever since we had the bad snow up here, mine has been sat at about 4 o'clock on the temp guage, where it has always been bang on level at 3 oclock??.

i have also seen a decrease in mpg. usually aound 27 but lately it's been averaging low 20's.

cheers

**PNuT** · Saturday 27th February 2010, 14:20

Originally Posted by danny-R

if not, does that mean coolant temp sensor or themostat??

ever since we had the bad snow up here, mine has been sat at about 4 o'clock on the temp guage, where it has always been bang on level at 3 oclock??.

i have also seen a decrease in mpg. usually aound 27 but lately it's been averaging low 20's.

cheers

yep, most likely the thermostat, especially if its taking a while to get there

**leet5r** · Saturday 27th February 2010, 14:45

Originally Posted by PNuT

is it getting up to temprature & staying there?

yeah it reaches normal temp and dosent move m8

**thebadger** · Saturday 27th February 2010, 14:55

Are you using an external BOV? (dump valve) Also might I suggest a broken Lambda sensor or maybe a bad spark plug?

If you are on a standard recirc valve it may be shot & loosing you boost under acceleration, or if it's a bad spark plug you may be burning fuel in the exhaust system which may mess the lambda (O2) sensors reading. (means it may keep putting in more fuel to compensate & give you the low figures)