Track mine with Fuelly (see below for running Ave) and have tweaked the car with VCDS so that it now very slightly under reads what the car is doing.

 

It is a Petrol vRS so I enjoy it - but it is nice to have an idea of how much I am enjoying it 

if you are worried about economy and costs, buy a non PD tdi and run it on chip fat! 65p a litre.... wonderful stuff!

Had a Revo'd PD140 A3 before, got bored and wanted Petrol again  :love:

My pd vrs over reads but only by a few mpg. Sounds like its car dependant on how badly they are out

The sceptical side of me (the dominant one!) believes the on board computers are purposely set to read high by the manufacturers to con the lazy into thinking they are getting better mpg figures than they actually are.

 

Your "scepticism" is more like "accurate assumption".  I am on my 3rd Skoda.  On all 3 the computer has been optimistic by a figure so close to 5% that it cannot be a coincidence.

Then we have

 

Over more than 10,000 miles my average fuel consumption has been 43.75mpg.  Yes, I do record every fuel purchase.  The Maxidot shows 46.0 so is just over 5% optimistic and this inaccuracy has been consistent since I bought the car.

 

 

All I know is when I stick £70 in I can get around 460 miles before its pretty empty.

That's on the journey from Brum to Carlisle and back with a bit of running around in between.

Not sure what that is in MPG on a 06 2.0TFSI, but I'm happy paying that price for the journey to take 2 adults and 2 kids with luggage.

Maxidot says about 40mpg but I've never worked it out.

Just worked this out and its around 38mpg so the computer isn't far out, I'm happy with it.

I only use the computer as a rough guide. Remapped vehicles, in particular, are notoriously optimistic with their estimations.

 

My un-meddled with CR170's mpg estimation doesn't seem to be far out, though.

 

Incidentally, has any derv owners noticed better economy recently (are we back to summer diesel now)?

My indicated overall mpg is very close to my calculated figure whenever I've checked. Pity the indicated figure resets itself so frequently.

I am very pleased with the mpg I get out of my car, being an automatic with some go in it.

 

Mine normally shows 49 mpg on the dash which is actually 45 mpg (tankful to tankful).  Once I did an economy run just to see what was the best I could get, the dash showed 56 mpg but the actual was 49 mpg.  After this episode of very gentle accelerator, the first time I put my foot down there was quite a cloud of smoke behind!  This makes me think that driving a diesel slow all the time can't be good.  My driving is normally 70% motorway and probably quite sedate, i.e - a lot more cars pass me than I pass.

Isn't the speedometer set to read between 5 and 7% higher than the actual speed you are doing? Or something like that.

None of the (many, many) MPG threads are worth the bandwidth they consume.

 

Too many variables to be able to add any value to a forum discussion.

tis not the summer diesel.

It is however due to higher ambient temps.

less electrical loads, plus engine comes up to temp quicker.

The brother who ran a suckler herd (cows to breed calves) always said

"heats half meat"

Exactly the same principle at work.

i.e.

Warm cows eat less.

PS

I averaged 68mph, "door to door"  tother night, mixed roads, Motorway, 50mph limited through the city and  incl some sections posted at 40.

About a 70 mile run, with fuel consumption in the middle high forties.

Now that kind of fast efficient driving floats my particular boat.

Edited 23 April, 201412 yr by dieseldogg

My Octy reads consistently 5% high, so I'm sure that once I genuinely got 70mpg on a round trip across Wales. When I ran Land Rovers and an Omega, I got retentive about mpg and logged everything in a book. After I found the Octy's offset was consistent, I threw the book out.

 

The comment in this thread about discarding fuel receipts is worth a note. I always keep mine for a week or so since I refueled at a local Shell garage and had to be recovered from a few hundred yards down the road.

 

I contacted Shell who investigated samples from the same pump (it is identified on the receipt). They said the fuel was OK. The garage report on the fault was not really conclusive, but within a week or so the garage was closed for tank cleaning and a few months later there was a longer closure for tank replacement.

 

I was actually quite impressed by Shell, who phoned me and sent a report, and suspect that, if there was anything wrong with the fuel, it probably just triggered a pre existing problem with the car - it was a Vauxhall.

As long as I get more than 600 miles per fill I'm happy!

None of the (many, many) MPG threads are worth the bandwidth they consume.

 

Too many variables to be able to add any value to a forum discussion.

.

Well I agree that quoting averages to ridiucous numbers of decimals is certainly a waste of time.  However, as I said in the OP, I find that the 25-percentile figures (rounded off to the nearest whole mpg) are a very useful guide and a basis of comparison between cars.  It tells you very simply within what range you can usually expect the fuel consumption to lie.

In other words, "average = 41.76 mpg" is a bit pointless, but "fuel consumption is usually between 41 and 43 mpg" is a useful guide.

 

Yet our torque convertor gearbox Steyr Puch van did "mean, median &mode" 24.xx over several thousand miles.

slavishly manually brimmed and recorded and calculated at each fill, which was generally 75 to 80 odd litres.

i.e.

Only the decimals varied, and even then, not exceptionally.

I found this most odd.

As even when I drove in hypermiling mode, I could not seem to incur a varience.

Nor did one long motorway run, at motorway speeds, towing a camping trailer down to Kent from NI, and back again.

very very odd indeed.

marcus

Just a personal opinion but:

Buy a 1.2 TSI or a 1.6 Diesel if mpg is your major concern.

Buy a petrol vRS or a 1.8 TSI if you want to have fun and not worry about mpg all day long......or all the other problems associated with the ever-complicated modern diesel engine.

You increasingly need to do serious miles to justify a diesel vRS over a petrol one with the current costs of diesel in the UK. In Europe the prices are the other way round and oil-burners make a little more sense...... provided you can stretch to 6 cylinders and avoid the 'Transit' rattle!

Mmmm disagree there. My diesel vrs is fun and economical. Even if I put in premium fuel it is absolutely more economical and cheaper to run than it's petrol counterpart.

As long as I get more than 600 miles per fill I'm happy!

 

^^^^^^ this works for me too!

None of the (many, many) MPG threads are worth the bandwidth they consume.

 

Too many variables to be able to add any value to a forum discussion.

Please tell me a more accurate method of measuring average fuel consumption than that used by me?

 

From my earlier post   -  "Over more than 10,000 miles my average fuel consumption has been 43.75mpg.  Yes, I do record every fuel purchase.  The Maxidot shows 46.0 so is just over 5% optimistic and this inaccuracy has been consistent since I bought the car."

^^^^^^ this works for me too!

.

Buy a 4x4 Octavia then - it's got a bigger tank.  That will of course make your car more economical and therefore save you money, won't it?

/sarcasm 

For what its worth - my CR VRS generally gives me over 50mpg av on my work run (according to Maxidot) - a tankful lasts around 520 - 530 miles.  It sees the red line a couple of times during the trip so it isn't driven like a pussy!  Consumption figures are a guide for me - they tell me that the car is performing how it normally performs and nothing else.

 

Also for what its worth - we are back on Summer diesel - main changes from Winter are the cloud point and CFPP (cold filter plug point) - this is so it doesn't go solid in your fuel lines, etc, when its cold.  Main spec points are unchanged Summer to Winter (Cetane, distillation, density, sulphur, etc) and are controlled by the BS EN manufacturing spec, which is also Trading Standards enforceable.

.

Buy a 4x4 Octavia then - it's got a bigger tank.  That will of course make your car more economical and therefore save you money, won't it?

/sarcasm 

 

Already have an Octavia Scout, but thanks for the advice though.

The previous car, also an Octavia regularly cleared 650 miles on a tank.

 

Maybe some us are a little less worried about that extra 0.1mpg than others?

Already have an Octavia Scout, but thanks for the advice though.

The previous car, also an Octavia regularly cleared 650 miles on a tank.

 

Maybe some us are a little less worried about that extra 0.1mpg than others?

.

Agreed.  But some of us are more interested in what our motoring costs us and therefore is what our fuel consumption is, than in precisely how many miles, yards, feet and inches we can do on "a tankful", whatever a "tankful" is.

The weird people are those who post at great length about their fuel consumption and the precise effect - real or imaginary - on this of using various types of special magic (and invariably more expensive) fuel, but who have no idea of what their real fuel consumption actually is and have never bothered to measure it, preferring instead to waffle on about meaningless things such as "miles per tankful" or relying on the almost certainly spurious readings on their dashboard computer.

If you're not interested in your fuel consumption, fair enough.  Many perfectly sensible people feel that they have better things to concern themselves with.  But if you are interested in your fuel consumption, it seems a bit daft to discuss it if you don't know what it is and have never bothered to measure it.

.

Edited 25 April, 201412 yr by Stuarted

......after reading all the posts on this thread, aren't you the one who's getting all anal about fuel consumption Stuarted???????????  Maybe you just like to get people going a bit????????????????  Have you ever thought about starting a thread saying that, 'Mrs Thatcher was the the best leader the UK ever had - debate'????????

 

You'll definitely got some good responses then!!!!

 

Keep smiling!!!!!!!!!