Ajm1981

Hi I have a 1999 turbo uk spec totally standard part from p1 exhuast. Just bought the car and it's really bad on fuel. Was getting about 12-14 miles per gallon. I got the car serviced and now I'm getting between 15 -17 mile to the gallon. Surely something's wrong. I don't flog the car, just tipping around. I know there's not great fuel economy on scoobys but they can't be that bad???

Arkynsei

Not mechanically minded but how are you calculating the MPG? If you have an Android phone, download and install "FuelLog" (Free version will do) and log your fill ups and odometer. Tracks the MPG of the car, find it an easy way to accurately calculate. Gives yearly cost too.. but we'll ignore that.

Ajm1981

It's roughly calculated by how many miles for 40 quids worth. I know this isn't accurate but theirs something wrong.

Brun

Roughly ain't good enough - full the thing up dive it round till it needs filling again and work it out properly! My std uk99 achieved 19mpg or there abouts! Are you using super unleaded? Swapping to that gave me an extra 2.5 mpg

irondrew

iTrader: (1)

Welcome to impreza fuel bills.... Its a wonderful place to be

daz b

17-19 sounds about right local driving.

ditchmyster

iTrader: (7)

Fuel consumption unless there is a leak is largely down to driving style.

If your revving it to 4/5k rpm in every gear and racing off the lights / pulling out of junctions then it will suck fuel, even 3/4k rpm will use plenty.

Letting it come on boost around town is just a waste of fuel, that starts to happen at around 2.5k rpm.

If you want to get anything decent mpg wise out of a scoob you need a delicate right foot, i get 28 out of my Blob wagon by being careful when pootling around town and doing general day to day stuff, with the odd blast at the lights to get ahead of the crowd.

First thing i would suggest is a boost gauge, then you can see where it starts making boost and act accordingly, then you will be able to save fuel for the real fun times on country lanes at the weekend like i do.

Oh and welcome to real performance car ownership.

lordharding

iTrader: (1)

I have a classic turbo and brim it and get 250 per tank which is aprox 24/25 mpg
And have achieved similar figures for over 12 years now
I use tesco super unleaded rather then shell
I do mostly short 20 mile blast too with very little long journeys

paulob1

iTrader: (1)

I drove my 280 bhp import to spain and got 27-28mpg the whole way travelling between 70 and 90 mph most of the time...was just careful with the on of switch..

snake1906

iTrader: (4)

Yr consumptions all sound pretty good to me this is my 3rd sccob and around town it does 46 miles to £40 what that is a gallon i dont know and with a scoob if yr worrying about mpg maybe you should get rid

tjmatt

iTrader: (1)

And you can live with that? One can only hope it was a typo. Works out about 7 mpg at 135p a litre. That is absolutely ludicrously poor if true. You can get much better mpg on a track.

Unless you only use your car for < 3 mile long trips, you need to improve your driving style or get your car looked at if you can't attain more than 20mpg.

Baz33

Iv got a impreza sport iv only had 3 weeks and I'm driveing it carefull and I'm get 25 mpg around town with the odd blast it will drop too about 20 if I cane it evry wear I'm hopeing it might do 28 mpg on a good moter way run but I don't think it will lol so your 15 to 17 from a turbo impreza I think is about right it the only drow back of a impreza is mpg but thay make up for it for being an awsome car

snake1906

iTrader: (4)

Thats with the mrs driving it going to work and taking the kids to school if i drive it fuel really doesnt last long but to be fair to it if i stay at 70 or bellow on the motorway i cn get not far off 300 miles from a tank which i thought was very good? Normal driving on motorway around 200-220 miles

snake1906

iTrader: (4)

O and i dont have a fuel leak when the mrs drives it she drives it slow and at around 330bhp when i drive im usually at 415bhp

DrDiesel

Not a 'problem' as such, more a characteristic.
Remember, its about Smiles per Gallon.

L.J.F

iTrader: (31)

Not to forget the P1 only has a 50L tank and short gear ratio aye Snake:£


I manage 240-250 on a long run but that's rare just like the car coming out of hibernation lol

Gear Head

iTrader: (2)

So you could be getting 20-22mpg which in this weather, is perfectly normal for local driving.
People buy these cars and see the manufacturer quote of 35mpg extra urban, and believe it!

20mpg is the norm for most Impreza turbos. Deal with it, or sell it.

Markyscoob

I'm sure I've said it before but it's pumping losses that kill your economy on an Impreza.

I drive my Sti 2.5 like I've got Miss Daisy in the back and can't beat 25mpg- probably the only way I will is to switch off and be towed by a mate's Micra!

I have a 350bhp motor, driving it at 2000-2500rpm to avoid boost and I just can't improve it.

Lesson:

Example 1. Impreza.Gearbox/diff loses 17bhp. Tyre, suspension 5bhp. Wind at steady 50mph, 17bhp. You need 39bhp to maintain steady 50mph. At 2,000rpm this will be at a very small throttle opening, so your car also has to suck against a closed throttle, dragging compressor and through an intercooler too. So that's another 3-4bhp needed just for that. So to produce 27bhp worth of motion, that's about 31-42bhp of fuel.

Example 2. Toyota Aego. 1.0litre. At 50mph the narrow tyres and small car need only 13bhp to maintain speed. To do this, the gearbox will consume 9bhp, the suspension geometry (narrow tyres and probably little thrust from camber/toe, etc) 1. So 23bhp needed. The Car will be at 2-000rpm in 5th and with nearly full thottle will bearly make that. (Try flooring it in top at 50 and nothing happens!). So little pumping losses of maybe 1bhp to be pessimistic. Sothat's 23bhp worth of petrol to do the job..

Compare. You're driving slowly at 50, as light on the gas as you can, top gear and bored as hell. 42/23. You get 28 at most like this . By this example the Aego would return 51.3mpg.

Probably the Toyota/Pug/Citroen does better but you get the idea.

Then again, try it in a Gallardo and see if the Scooby is bad...

snake1906

iTrader: (4)

the p1 has a 60ltr tank m8

http://www.p1woc.co.uk/P1/p1spec.htm

http://www.carfolio.com/specificatio...ar/?car=166694

bioforger

iTrader: (1)

No nothing is wrong and yes they are that bad, especially around town, short 5-10 mile trips with heavy right foot = <20mpg easily. Obviously check your tyres n pressures are ok as this can make a small difference.

juniorc

Had my classic wagon for 2yrs now and i very rarely see above 20 mpg,i was a bit concerned at first but you soon get used to it!!Mines completely std on a w plate,150k miles and runs perfect,there just not built to be frugle and generally neither are there owners

kevo10

had similar on mine until i changed the coolant temp sensor and the lambda sensor. went up to around 25 and drove better too.

paulob1

iTrader: (1)

dont the later injectors offer better fuel spread in the bores and improve economy...I have no idea if they are a simple bolt in but I am sure I read it somewhere that they improve the combustion efficiency which seems to the the scooby's big fault, permanent 4x4 dont help either...