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MPG

944 LIL

New member
Inspired by the talk of air density / temperature etc, I decided to work out my MPG. I know its going to get better in summer, however, 18.04 MPG sounds very bad indeed.

What should I expect?
 
Crikey, I get that in the turbo when I'm gunning it a bit and doing a lot of town driving. 32mpg in the turbo on a long journey at a constant 60/70mph.

18mpg for a lux doesn't sound very good at all. I was regularly getting 27+ in my S2.
 

Some years ago when I had my first Lux I use to average around 32 mpg on my regular commute.
I though my S was low at around 27mpg when travelling at around 65 mph , so 18 seems very low !
 
For me 32mpg on a run- 36mpg if I try really hard! Average including town driving, going to work etc, is 26mpg. Thats an S2.

If you are getting 18mpg either you have boots of lead or something is wrong- check the air filter is not blocked!
 
I get around 25 average on my Turbo, mixed driving, so that 18mpg does sound very low!

Love your signature strap line btw, Colin!!! [:D][:D]
 
32 mpg on my Lux and 30mpg on my S2
With such a high MPG I would check the fuel rail pressure relief valve .If its not relieving excess fuel pressure then your injectors will be passing too much fuel. I would expect your engine to smoke a bit on hard acceleration and possibly on startup. You could get the garage to do a fuel pressure test. Clarkes garage workshop manual has the pressure ratings

 
Nick

The line came from a guy I met at rugby with my son this morning - known him for years - but as I run a different squad have never really had a chat.

I mentioned LIL just after he told me he had a Ferrari 355 - he also has an Alvis (I think) from 1910, something from 1911 and a 1927 Buggati - and just for good measure a 1928 Buggati.

He more than anyone needs to be economical with the cost truth !!

 
18 MPG ? Have you bought a 928 by mistake ? [;)]

That does sound poor, mid 20's upwards would indeed seem to be the norm.
 
LIL had a service on Saturday and I took it on a 350mile round trip yesterday and today - 31 MPG !!
Very happy with that....
 
Colin,

RESULT!

Glad to hear it. Told you she would do more than 18 mpg ...

... now you just need to drive her a bit more! You can justify it now. She's soooo much cheaper to run ...


Oli.
 
Well i've been averaging 22 - 25mpg over the winter which is exactly what I get in the summer (well what qualifies for a British summer at least). So at 18mpg sounds like you're really going for it!!

If you drive like a Nun and suspect there is something amiss with your car then there are a few things to check:-

Tyre pressures
Wheel alignment (are you getting equal tyre wear across the width of your tyres)?
Weight - are you carrying alot in the car e.g. stuff in the boot
Do you drive with your window open? This can cost you 5%! (I doubt it in this weather though).

You could also take your car to an MOT garage and ask them to check your AFR to see if you're running particularly rich. It could be something is throwing your fuelling out.

Check for binding brakes (though you'd probably be getting other signs if this was the case, like it pulling to one side, smell of hot brake lining, blueing of the disks).

Does your handbrake fully disengage?
 
James

remind me again - what was your recommendation for size and make? Should the rear tyres be the same?

 
Colin,

Ummm, yes, I think you should certainly change the front tyres immediately. The ones on there are ... not healthy. And the fronts do the majority of the braking, and you don't want to be over-working the ABS without good reason, eh?

The make that both James and I run is called Falken, and the model FK452. They are excellent. I can't remember what width you have at the moment but you need to maintain the rolling radius (the radius from the centre of the wheel to the outside of the tyre), and there are various on-line tyre calculators to help you do this. (One can be found here:

http://www.carbibles.com/tyre_bible.html

... along with more than you ever needed to know about tyres - it's an educational read.) I would suggest that you reduce the width of your front tyres - I can't remember what they were, but they looked too wide for the car to me.

Anyway, James will be along soon with some much better suggestions, and some real numbers. He'll offer much better advice, I'm sure.


Oli.

ETA: Having a different make of rear tyre to the fronts is not a problem, but they should be the same on an axle (i.e don't have two different tyres on the front, or on the rear.) As I remember, your rears were OK, but an unknown make. I'd probably just enjoy sliding the car around for a couple of months, getting rid of most of the tread, and then replace them.
 

To echo the above, I use Falken 452's on my Octavia vRS and have found them to be very good. Unfortunately they don't make them for my 15in teledials, otherwise I would have had them straight away.
 
ORIGINAL: 944 LIL

James

remind me again - what was your recommendation for size and make? Should the rear tyres be the same?

Apologies Colin, have been busy with the DIY so not been on here recently. Oli is right, in terms of matching tyres on each axle line, but his memory must be fading a tad ([;)]) as I remember you having Goodyear Eagle GSD3s on the rear, so they should be pretty good. I also think you have 245 section on the front, which as Oli states would give much nicer steering feel if you came down a size or two. Something like Goodyears sized up to fit (http://www.camskill.co.uk/products.php?plid=m4b405s16p0) would be circa £80 a corner from Camskill. Do check though that your rolling radius is correct for that profile size.

Let us know how you get on.

Cheers

James
 

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