Another MPG thread!

Mpg is worked out by:
Litre/4.54=x
Miles run/X=MPG
To improve:
Good servicing, pump your tyres up a couple of psi, change gear at the right revs.

Mine got really good mpg this morning on the way to work thanks to nobody getting out the way on the M54

Mines pants at the moment at 32.5mpg, haven't started to clean/upgrade anything yet. Just had a service so maybe it will start climbing, mainly sat in rush hour traffic half the week tbh, going on a run to Cornwall soon so will see what she puts out then.

my mpg is rubbish, not sure if its right or not.
but generally get if i drive ok 25mpg 1.8t quattro cab.
if im really good, can get it reading 30mpg,
if i have a heavy foot it drops below 20mpg.

generally i get 200 miles from £50

what do other cab owners get ??

Managed to get it up to 37mpg on a longish run today so must be all the stop/start traffic around Bristol keeping it low

There all fantastic mpg,s compared to mine, I am currently getting 12mpg in my s4 cruising round miami

barkclark said:

I'm pretty anal when it comes to MPG and logging my fuel returns. As when I first got my B6 1.9TDi I though my MPG was pretty poor: ~38mpg! I've cleaned EGR etc, going to do the turbo, change thermostat/CTS and maybe clean the MAF. I've been running some premium diesel every now and again (which doesn't actually cost anymore than normal once the sums are worked out!)!

As you can see below I'm making progress. It's a mix: Motorways, around town, a/b roads, a blast every now and again. Which I think is a good representation rather than say, 90% motorway driving!

I reset my trip computer when I fill up and work it out that way. I know there's a reserve amount of fuel but seeing as I fill up when it hits zero my mpg calculations shouldn't be too far away!

What way do you work out your mpg? Anyways to improve it? One thing I haven't tried yet is using a fuel additive!

Cheers!

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If you ever hire a vehicle on a fuel deposit (like a boat) they always send you out with a brimmed tank and then brim it on your return to measure the exact amount of fuel used while in your possession to work out the refund. It's the only simple and accurate way to measure what's been used.

Most folk tend to try to measure miles driven on a full tank till empty but if you think about it the pump is measuring empty till full (and it's supposed to be properly calibrated). Measuring miles from empty to full makes way more logical sense (to me anyway). Doing it the other way leaves too many variables like the reserve and the amount of fuel in the fuel system, expansion with temperature etc.

Here's my method doing it 'backwards' by assuming my full tank is completely empty:

1. Fill up till it brims with the nozzle click
2. Note your odometer reading (This is your zero fuel in the tank reference point)
3. Every time you fill up always get a receipt and note your odometer reading on the receipt.
4. Obsessively note your odometer reading on every fill up against the actual volume of fuel purchased.
5. If you forget, abandon and start again from scratch.
6. Keep this up for at least 2000 to 3000 miles
7. This is the important bit - don't forget to add the last fill up amount to the fuel used, even though you haven't used it, you have. You're measuring full to full. Full = Empty

That way you are working out actual miles driven against actual litres used as accurately as possible over a realistic range of conditions. The capacity of your tank, reserve, and fuel system are completely irrelevant. The result will as near as damn it your actual average fuel consumption.

My MPG? No idea. I keep buggering up by forgetting to log the mileage LOL

[Edit]

Forgot the wisdom bit:

Learn your engines sweet spots and drive as close to them as time and traffic flow allows. You will be driving like a nun well below the speed limit but you'll save fuel. Never gun it till it's warmed up. Never use Cruse Control, it uses acceleration and braking to maintain speed. You can do a lot better than it yourself by taking advantage of the dips and momentum and controlled acceleration on the climbs. Use the gradient to your advantage. Take all the crap out your boot that you lug around for no reason whatsoever (I must have the weight of passenger in junk in there most of the time). Never skimp on servicing. I know a lot of folk who complain about performance but stretch the oil change and filter intervals by months or even longer.

Try fuelly.com which plots it on a graph and shows pence per mile too

barkclark said:

So far over the past 4 months I've averaged 46.9MPG, highest being 49.1MPG. Anyone regularly get over 50MPG? I need a thermostat and CTS change so hopefully that'll push it beyond the mysterious 50 mark!

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Similar to our A6.

I am sad too I log my fuel every fill up, litres vs miles.
47.18, 47.89, 47.69, 47.92, 47.65, 47.46, 46.84, 45.78.
47.6 average before I fitted my summer tyres! My car is an A4 avant quattro sport 1.9 with 170bhp remap.
Last two are from when I changed to my summer tyres - winter tyres 225/45 17, summer tyres 235/40/18. I was expecting the summer tyres to be more efficient than the winters because winters use softer rubber but maybe the extra width off sets this?
I don't think that the fill up way of measuring mpg is totally accurate as it relies on filling up to exactly the same level each time and different pumps have different cutout points but thee isn't another way.
I drive mainly on dual carriageways and A roads, 25 miles each way to work so my car gets hot each run so that helps the mpg rather than short journeys. I would say I use average acceleration, not like a granny and not like a BMW haha, but I do overtake occasionally have have an occasional blast to clear the cobwebs out!
I've been testing different speeds on my same work route, a week of 60mph a week of 65mph and a week of 70mph and they all returned the same average 47.+mph. Quite surprised. I think if I cruised above 70mph then that would start to hurt my mpg. I have noticed that now I have my summer tyres on the mpg appears more sensitive to speed i,e cruising above 65 starts to hurt the mpg.
One other point my DIS seems to match up quite well with my measured mpg's. Long term DIS average mpg is 48.5mpg so 1 over my measured average which I don't think is too bad compared to other peoples comments.

Tom.

dares_uk said:

my mpg is rubbish, not sure if its right or not.
but generally get if i drive ok 25mpg 1.8t quattro cab.
if im really good, can get it reading 30mpg,
if i have a heavy foot it drops below 20mpg.

generally i get 200 miles from £50


what do other cab owners get ??

Click to expand...

Used to regularly get 40mpg from mine before I had it mapped. It's now down to about 30mpg due to my newly heavy right foot! But on the odd occasion when I get to do a relaxed A-road run it'll show 44mpg or more . . .

My 1.9tdi Quattro averages 45mpg pretty much regardless of where I drive. Car is going in for Terraclean on Monday so it'll be nice to see if there is an improvement after.

i always start feeling a bit glumb when reading theads like this, my 3.0 quattro avant averages 15-16mpg over a tank, THANK GOD FOR LPG