My vRS has now got over 6,000 miles on the clock after under 2 months (!) and I've noticed the fuel consumption is improving. I got an avarage 56.8 mpg on the last tankfull but when I filled up I squeezed 43.5 litres in to the tank. As I'd only driven 465 miles I was wondering how people can get 600 miles to a tank that some people have reported!

What is really confusing me is that the trip computer is pretty much bang on at predicting how many miles are left in the tank but it can't be right saying 56.8 mpg when my sums make it 48.63 mpg. Am I right?

Mike

my sums also make it 48.63mpg. I could never get 600milesa out of my tank used to fill up when she had done 300odd and that was about a quarter full maybe less.

I've done 230 miles and the needle hasn't left the top yet, tank average is 60mpg so far (my fault for testing the strut brace on the C&F road, I have been getting 70 or 71 mpg on the daily 45 mile commute the last few days).

My target is 700miles out of a tank.

By the way, this is using the expansion tank trick.

Evening guys

you lot must be driving round like granny's to get that fuel consumption :P

Iv'e been trying to get these figure's but its not happening yet:rolleyes:

My Vrs has now done 1300 miles, last time I filled up i managed to get

Just be steady.

If it makes you feel better, I got 30mpg average on a blast up the Cat & Fiddle on Sunday, and that was in the wet (can get a lower mpg in the dry).

I get about 400 miles from top of tank to when the really very unnecessarily loud fuel reminder bongs into life. I'm not positive about this but if the Fabia trip computer is like my old Vauxhall where one the average MPG is constantly updated and weighted more by the last 15-20 miles, so even though you may average 50 plus whilst on the run, the initial starting and warm up period drags down the real MPG for the whole journey, i.e. not the actual average for the whole journey but the current average for the last X amount if miles. Could well be wrong, sure someone here knows more exactly about it. Out of interest the fuel economy in mine was totally inconsistent and often awful until it past 15,000 miles and settled down, it'll improve with time. The highest I've ever seen was this morning at 58.8, but that was driving like the afformentioned old woman due to traffic and could have probably had a cup of coffee on the dash and not spilt it.

Mike,

I have had 700 miles from a VERY full tank.

This was only possible because I did the following trip -

Carlisle - Andover (M6/M5 etc) the Motorway was quite 'open' for a change and by the time I got home I had done 704 miles and the reserve said 6 miles !

I never went over 70mph (62 mph on the Motorway - 6th gear 1800 rpm) and used the cruise whenever I could. But I regulary get over 60mpg averages. Mainly cos I drive within the law (most times)

I rarely got better than 50mpg on the OE Michelins, and now I've fitted Proxes all-round, I don't think I'll be seeing that kind of fuel economy again (although 48-49mpg on a long trip at my usual - ahem - 'brisk' driving speed / style is fine by me!)

I know from my last Manchester-Edinburgh-Manchester trip that a topped-off tank will get me just over 500 miles. I know this because when I filled up once I got back to Manchester, the computer said I had 5 miles left in the tank, and I'd done 499.2 miles that day. I did consider (for about a second) running it until it completely ran out of diesel - in the name of science, you understand, but common sense took over and I filled up!

Must add here that usually I'd fill up when I get to Edinburgh, and then when I get back home, rather than doing it in a oner, as I gather it's a Bad Thing to drain the tank completely.

And as for the scary-loud warning beeper, it's usually enough to make me fill up as soon as possible after it comes on, just to stop it happening again next time I start the car! Same with the washer bottle... :P

Same with the washer bottle... :P

Didn't know the washer bottle had a warning ?

It depends on fuel, temperature, speed driven, I can't be bothered doing 62 mph on the motorway I must admit if it's NSL

On the flat roads in NL it was much better though

It depends on fuel' date=' temperature, speed driven, I can't be bothered doing 62 mph on the motorway I must admit if it's NSL

On the flat roads in NL it was much better though [/quote'] I did the 62mph thing just to keep the turbo 'off' and it was a bit of a challenge with my Dad as he's always giving me grief for buying "a crappy foreign car".

Well he's 76 now, poor old git !

Didn't know the washer bottle had a warning ?

You will when it runs low! Guaranteed to scare the cr@p out of you

Chris

Don't feel safe at that speed, no way I'd drive down a motorway at 60ish MPH, getting stone splattered by HGV's as they move in 2 feet in front of you after overtaking you, and people nearly driving into the back of your car when they don't realise you're going so slow. Way too boring to keep concentration too. When in a foreign country I find that a constant 80 MPH will give an average of 50 MPG, which has always struck me as a reasonable compromise. Or I take SWMBO's Polo TDi which will average over 60MPG at 80 MPH, which leaves more a few more beer tokens.

Don't feel safe at that speed, no way I'd drive down a motorway at 60ish MPH, getting stone splattered by HGV's as they move in 2 feet in front of you after overtaking you.

HGV's are limited to 56mph so if your doing 60 then you'll be over taking them.

HGV's are limited to 56mph so if your doing 60 then you'll be over taking them.

Indeed Neily:thumbup: The worst of them are the Irish registered HGV's on the M6 blatting along at 80MPH. (obviously at night, as otherwise average speed would be 0.0001 MPH)

let me know your secrets: LOL

Don't use cruise, use overrun loads, never brake

OT: Since dragon box went on mine reported 65 from midlands to north - I'm guessing they make the guage overread?

OT: Since dragon box went on mine reported 65 from midlands to north - I'm guessing they make the guage overread?

The Dragon box can't make the guage overread as it just changes the value the sensor reports - the ECU still knows how much fuel it is injecting I suspect it's down to being able to use less throttle with the extra torque/power....

Chris

Interesting posts. I am still confused why the trip computer is pretty bang on with the miles left in the tank but not with the MPG as surely it is all part of the same calculations, eg, fuel used over a given distance?

Anyway, even 48mpg is bliss. My Scoob averages 20mpg (when driven briskly but not like a loon)! To be fair to the vRS I don't crawl along but I do tend to drive it like I'm generally trying to be pretty sensible.

Mike

By the way' date=' this is using the expansion tank trick. [/size']

Anyone care to explain what this is?????

Cheers

Dave.

I am still confused why the trip computer is pretty bang on with the miles left in the tank but not with the MPG as surely it is all part of the same calculations, eg, fuel used over a given distance?

Don't forget that there's about 4 litres in the tank when the sensors stop reading any fuel - this is because of the way the fuel guage works and is the same for virtually all fuel tanks (except Challenger tanks apparently )

So basically the computer's wrong on all counts!

Anyone care to explain what this is?????

Cheers

Dave.

It's been on here often before, but to summarise:

Just inside where the filler flap hinge is, there's a little black button that vents the expansion tank (I'm presuming from where it is that this happens automatically when you shut the filler flap.) When the filler nozzle clicks off, push this button towards the middle of the car (sort of left if you're looking into the filler opening from the back of the car.) You will hear a whoosing/slurping noise for a couple of seconds, which I gather is the vacuum in the expansion tank being released. By doing so, you'll be able to cram a few extra litres into the tank. This isn't recommended for petrol Fabias, as apparently you can mess up some filter or other, and I suppose there's the potential for damage whatever engine you have, which the warranty WILL NOT cover, as you will have defeated a protection system. Therefore, you shouldn't attempt this if you're only going to drive the car a trivial distance after filling, or if the weather's cold but about to get warm. If you're going to drive more than a couple of miles fter filling, or if there isn't an impending heatwave, you'll probably be OK, but I wouldn't personally recommend doing it unless you're off on a really long trip where you'll need the extra fuel...

The Dragon box can't make the guage overread as it just changes the value the sensor reports - the ECU still knows how much fuel it is injecting I suspect it's down to being able to use less throttle with the extra torque/power....

Chris

Hmmm, really? I was getting almost 70 at one point of the journey. I know they claim fuel economy savings and I am an economical driver (even driving quickly I use less than some people driving normally), but if that's right I'm on for a fair saving then.

Hard to say cos I've done 500 miles on it and not used my own car since :thumbdwn:

It's been on here often before' date=' but to summarise:

Just inside where the filler flap hinge is, there's a little black button that vents the expansion tank (I'm presuming from where it is that this happens automatically when you shut the filler flap.) When the filler nozzle clicks off, push this button towards the middle of the car (sort of left if you're looking into the filler opening from the back of the car.) You will hear a whoosing/slurping noise for a couple of seconds, which I gather is the vacuum in the expansion tank being released. By doing so, you'll be able to cram a few extra litres into the tank. This isn't recommended for petrol Fabias, as apparently you can mess up some filter or other, and I suppose there's the potential for damage whatever engine you have, which the warranty WILL NOT cover, as you will have defeated a protection system. Therefore, you shouldn't attempt this if you're only going to drive the car a trivial distance after filling, or if the weather's cold but about to get warm. If you're going to drive more than a couple of miles fter filling, or if there isn't an impending heatwave, you'll probably be OK, but I wouldn't personally recommend doing it unless you're off on a really long trip where you'll need the extra fuel...[/quote']

Cheers mate...... It's all a bit cleared now.

Cheers

Dave.