If it says 30 litres on the pump but it delivers 32 then the consumer wins - do Weights & Measures catch that case as well?

Dunno. I guess the garage would watch out for that one

Just out of interest, how are you measuring actual mpg?

Always filling up to the second click on the pump - seems generally to give consistent figures. Everything's then entered into a Psion 5MX spreadsheet. The vRS's tank seems to fill well without bubbling or blowback - I've only once found a "difficult" pump. Any inaccuracy is taken out at the next fill but the figures I quoted above correlate well to the actual driving encountered. The fact that the computer is consistently under-estimating consumption demonstrates there's a calibration problem somewhere. I'll report it at the next service with the figures to demonstrate the problem but that won't be for months yet.

In Autocar's long term test there best MPG was 51.9' date=' the worst was 24.4 (this they achieved during a day of performance tests) and the test average over 15,000 mles was 42.1.

They also reckoned about 400-450 miles a realistic tank range.[/quote']

Well I know that the range is a load of twoddle. This week down to my house in Oxfordshire 169 miles + 6 days worth of a round trip commute to goto work thats around 24 miles * 6 ( I had to go twice one day in the morning to sort some stuff out - that's why it's 6 ) Plus a run to the local chinese in witney from work and back (about 4 miles) + the commute from oxfordshire back home, another 169 miles. That's around 486 miles of moving back and forward. Oh and I have 50 miles worth of fuel in the tank. So, that gives us a nice fat 536 miles.

Personally, I think max crusing range is around 675 miles on a full tank of Diesel and doing a long motorway journey. The trip computer has been up passed the 600+ mile mark before now aswell.

One thing though - I'm probably one the most fuel efficient Fabia drivers on this board (and I get stick for being so), bur I'm not a mod-man (maybe in time I'll get a CD player ) and I expect everyone who's uprated their trusty furbys to decrease their performance quite a lot.

Regards,

I've found my car's computer pretty much agrees with mpg calculated by looking at fuel receipts and mileage on the odometer.

However I do usually fill up at the same petrol station (?diesel station?) - so my "actual mpg" calculation is reliant on the accuracy of the pumps measuring how much fuel I put in.

Don't forget folks that the density of Diesel is greater in colder temperatures, so you get a bit more in your tank on a cold frosty morning than you would later on in the afternoon when things warm up!

Regards,

Always filling up to the second click on the pump - seems generally to give consistent figures. Everything's then entered into a Psion 5MX spreadsheet. The vRS's tank seems to fill well without bubbling or blowback - I've only once found a "difficult" pump. Any inaccuracy is taken out at the next fill but the figures I quoted above correlate well to the actual driving encountered. The fact that the computer is consistently under-estimating consumption demonstrates there's a calibration problem somewhere. I'll report it at the next service with the figures to demonstrate the problem but that won't be for months yet.

Unfortunately it is a consistant problem with trip computers on a lot of cars :eek: . Lots of car magazines comment about it on long term tests. It makes the car seem more fuel efficient :thumbdwn: .

Personally, I think max crusing range is around 675 miles on a full tank of Diesel and doing a long motorway journey.

I doubt that. Since I zero the ordinary trip at each fuel fill I can readily compute the total range continually by adding the trip figure to the remaining range figure. The most I can get this figure to is around 530 miles even when driving gently. I target to get the combined figure at around 500 miles but find it usually drops to around 475.

You'd have to be driving very gently to get good economy on the motorway - I've recently compared my journey to my father's which is 94 miles direct and around 120 miles by motorway. The fuel economy going direct on ordinary roads averaging around 50mph is around 54mpg compared with the 49mpg recorded the time I went on the motorway averaging around 75mph on cruise.

I've found the warning beep chimes at around 70 to go.

I doubt that. Since I zero the ordinary trip at each fuel fill I can readily compute the total range continually by adding the trip figure to the remaining range figure. The most I can get this figure to is around 530 miles even when driving gently. I target to get the combined figure at around 500 miles but find it usually drops to around 475.

You'd have to be driving very gently to get good economy on the motorway - I've recently compared my journey to my father's which is 94 miles direct and around 120 miles by motorway. The fuel economy going direct on ordinary roads averaging around 50mph is around 54mpg compared with the 49mpg recorded the time I went on the motorway averaging around 75mph on cruise.

I've found the warning beep chimes at around 70 to go.

Well, I've had 71.2Mpg from the same 169 mile trip I was talking about earlier.. so we'll have to disagree. Like I said I drive for economy - not speed. But you won't find me going at a snails pace either on the motorway, but I don't hammer it, not my style.. I generally always get a return of 60+ mpg on the motorway.

Regards,

Like I said I drive for economy - not speed. But you won't find me going at a snails pace either on the motorway, but I don't hammer it, not my style..

Presumably one trick is never to brake...

I find some journeys are more economical than others - I think things like where the hills are and prevailing wind direction count as well as traffic.

I find that just by displaying the instantaneous mpg on the trip computer makes me more aware and I tend to drive more economically.

I never get near to 70 mpg though :(. Even on a recent long motorway/dual carriageway run with clear roads, I still only got 58 mpg, trying carefully to stick to 70 mph (indicated anyway - probably a few mph less really).

I find if I do 65mph on the motorway - I save an absolute shed-load on fuel and economy soars. I always leave current mpg indicator on the trip on myself - it's really good at helping stop the lead foot syndrome. I don't see what the big-rush is these days. I mean - people rushing home to sit in front of the tv for an extra five or ten minutes.. craaaazy

Regards,

Well I know that the range is a load of twoddle.

No it isnt. Thats about what I get. Then again, not all cars seem to be the same - I was coming home last night, and when the car had warmed up I looked at the instant MPG reading at 70 mph in 6th and it was reading only 44.7 MPG. My average MPG readout is about 38 MPG but I dont hang around

I dont think some people take driving styles and types of journey into account. If you sit at 60 mph on a motorway for 100 miles of course you'll get 55 MPG. If like me you have a 7 mile journey on varied roads and the rest is spirited B road driving then you'll get far less.

Well, I've had 71.2Mpg from the same 169 mile trip I was talking about earlier

I cannot get anywhere near that figure!!! - do you have the earlier higher geared car? - though I can't see it would make that much difference.

The best reading I've seen from the onboard computer for the average mpg is 59.2 whilst running in and treating the car gently going at or below speed limits - I cannot even get to 60mpg!!!

I've discovered the possible reason for the discrepancy above.

This thread was originated by someone asking for Fabia vRS fuel economy figures but others have joined in notably "skodaTDI" who has a 100bhp Elegence not a 130bhp vRS.

Thus it's understandable why he's getting better figures than me!

Thus it's understandable why he's getting better figures than me!

That's surprising - I've never seen above 60mpg in my TDi Elegance, and that was with me driving like Miss Daisy. Normally, I see between 45-55mpg on my normal enthusiastic runs

Chris

I've posted elsewhere on fuel economy - there's a whole host of reasons, I won't go into them again. But, yeah I get a good return - I'll post a pic of the trip computer next week after my afore-mentioned 169 mile trip. Every journey is different lets not forget this, but I don't understand why other people don't get out of the 50s MPG range sometimes.. it's a little puzzling.

Regards,

I drove a fair few miles (about 300) in my 100bhp TDi and was getting around 58mpg too.

Anything over 50mpg and I'll be pretty happy. I did order cruise not only for the fuel economy (which tends to be WORSE with it on, if you drive yourself you can usually do better, but it means a LOT more effort but also to stay on the relatively legal side of the speed limit, hehe.

Couldn't afford to loose my license in my current job, I'd pretty much end up loosing the job :(

I set off from Nottingham to Dudley on Sunday morning and had 2 hours to waste before i got to Dudley so i drove slow. I followed a Tanker at about 55 mph all the way and i managed to claw my average mpg from 43mpg to 52mpg. Then on the drive home from Dudley to Leeds it dropped back down to 44mpg lol

Went out in a 2 year old Seat Cupra R today and at 90mph on a slight uphill on the motorway it read 23mpg!!!! Glad i went for the Diesel option

Went out in a 2 year old Seat Cupra R today and at 90mph on a slight uphill on the motorway it read 23mpg!!!! Glad i went for the Diesel option

What do you get in the diesel on the same stretch @ the same speed? I would have thought 23 MPG at 90 mph going uphill isnt that bad actually...

The diesel ought to do better than that as it can torque it's way up

:confused:

A warning to everyone!

Just like you can't trust the official Skoda figures to be the ones you'll get in reality' date=' neither can you trust the computer readout to tell you the correct fuel economy being achieved. [/color']

I was waiting on posting this information till shortly before the car needs a service in the hope that other know whether the dealer can make the computer more accurate.

However here's the story to date:

Mileage - MPG actual - computer readout - difference:

335 - 45.9 - 48.5 - +2.6

704 - 49.9 - 52.2 - +2.3

1043 - 42.8 - 46.8 - +4.0

1401 - 48.0 - 50.0 - +2.0

1728 - 47.8 - 51.1 - +3.3

Is anyone else carrying out a similar analysis?

Can anyone explain the consistent over-reading?

Yes, I do a 35 mile run - each way - 5 days a week and have been keeping an eye on fuel consumption. I top the tank up at each fill up, note the miles travelled and work out the fuel consumption. When I compare this figure to that on the computer there is a vast difference. Using the fill up to fill up method I have averaged 54 - 55 MPG over 8,000 miles. The computer tells me that - by the end of the trip - I am getting 60+ MPG (on one occasion, by taking it very steady) it told me 70MPG! The comulative MPG indicator on the car is currently reading 60.4 MPG. It was over 65MPG at one stage. In the words of Victor Meldrew "I don't believe it!" Does anyone know how these MPG computers actually calculate the values?

Regards

Its the luck of the draw if you get a "tight" production car (engine,gearbox,diff,wheel bearings,even brakes) but they all loosen up eventually but it can take 50,000+ miles if you drive gently!

Tyres (makes and pressures), even if you clean the car makes a difference!

Driving style makes a big difference as does average speed - I suspect most who say I don't hang around but get 100mpg don't quote their true average speed (computer)

The road conditions -road surface, gradients, anything that require other than constant accelerator pedal.

Weather (wind direction and strength) can make a big difference.

Traffic conditions- if you need to constantly change speed.

Finally you can get up to a 20% hit if you've got your a/c on!

The best tips I can give are

Remember that braking is lost energy - plan ahead

Gentle acceleration in the lower gears is not optimum - you waste more fuel than moderate acceleration would.

Limit your top speed.

Trip computer works out mpg from speed and the fuel metering both calculated in the ECU. Usually very accurate, unless tyre size is not standard. But subject to manufacturing tolerances (injector size mainly)