The 4x4 Yeti have a 60 litre fuel tank.

I have never got anywhere near putting in 60 litres, even with an 'empty' tank and a range of 0 miles.

The most I have ever managed to get in is 54.45 litres.

What I deduct from that is that I could generally drive my Yeti for many more miles before actually running out of fuel. (As per Top Gear economy run with jag from europe to Blackpool a while back)

You arsked the quessy RockyPops, so you gets the answer!

As you know, or even if you didn't, I keep meticulous records (=anal) of all what my Yeti contrives to confound me with, and for this, on the sixth of the tenth in 2010 I filled it up to the brim with 57.20 litres, costing £68.75 pees, too.

At that stage, on summer tyres, it returned46.34 mpg.

Next most was 54.53, and a number of them around that mark. And a 55.21 too.

And at no time did I contaminate my footware with excess fuel in my exuberance.

Edited 25 May, 201214 yr by Freshacre

57.71 litres. Drove it to a range of 0, then drove it another three miles as both local fuel garages had closed.

My anally rententive chart gets rounded to the nearest litre, and shows 55 litres as my largest fill.

I'm saying nothing about the capacity of Graham's an*l cavity and how large any filling might be, lest I be sent to the corner again.

I have managed to fill 55.8 liters, and covered 702km with that. Range was 0 for quite many kilometers by that time, but an*loge needle was still bit alive

Averige consuption from that tank 7.95 l/100km (35.5mpg).

I generally fill up not long after it tells me to, just in case I get called out or need to do an unplanned longer than usual drive at silly o'clock. The most I've had to put in is about 50 litres, but it's usually about 47 or so. I average consumption over 3 tanks to account for the variable residue (my friend reckons if I ever get thrown out of the ministry, I could be an accountant, but I really don't think so!) - mileage is generally around 42-45 mpg, which isn't bad for chugging around t'Pennines. I did have a couple of long runs recently which brought that figure up to 54 mpg. We'll see what our trip to Scotland does for it.

The quoted reserve is 10 litres, so the light/bong should come on around then; mine appearers to be closer to 12 as the most I've put in is 49 litres. Usually fill up on local driving runs when the gauge gets to the half mark or just below.

TP

Never try to keep filling after the pump switches off, the is a fuel expansion volume allowed for in the tank,which is there for safety reasons. ( It's all in the handbook )pages 200 to 202

I always stop at the click. It is too time consuming to 'brim' the tank and it needs the expansion area for good reason.

Surely though the available/published size of 60 litres does not include the expansion area.

I haven't got the bottle to take the range to zero (or less) and usually fill needing 51 - 53 litres.

Largest fill up though was just 10 days ago when I got 54.75L in (until the pump nozzle auto-clicked off, I too gave up filling to the brim some years ago).

Consumption was a lowly 35.14 (calculated - average for me, maxidot showed 37.4).

Slightly off topic I know, but has anyone noticed their diesel yeti economy has improved during this warm spell we're having? I currently drive a cr–V and it's economy swings (careful Bondage) as much as 4 mpg between the coolest winter days and the warmest days

Mine hasn't!!

But I put that down to having the air con on all the time.

In general the experts reckon that a cool but damp morning gives the best consumption, as supposedly there are more O2 molecules in the air.

In general the experts reckon that a cool but damp morning gives the best consumption, as supposedly there are more O2 molecules in the air.

I thought it was a case of cold air is more dense, so you can put more fuel in; hence worse consumption as opposed to hot air which is thin so less fuel used and better economy ...

..... but then to drive at a given speed/style in either condition will require the same amount of fuel (to produce the same power); just need more throttle (unless you drive at full throttle all the time in which case my synopsis above will/should apply).

I dunno!

I is just reitterating what them egg spurts says.

I remember reading somewhere its down to humidity, damp air (misty) gives a better performance. In the old days I'm sure that some blown engines (supercharged) used to deliberately add moisture to the mix to increase power.

Looking at it from an (ex) Firefighters point of view, more energy is absorbed by a fine mist than a jet with larger droplets. Perhaps the combustion process is slowed by the increased humidity level of the mix and therefore prolongs the burn cycle.

I can clear up the moisture thing but not the low temperature stuff.

Adding water to the combustion chamber increases power output (or conversely can reduce fuel burn for the same power). It is essentially due to the vaporising of the water into steam, builds pressure in the combustion chamber providing some of the work in displacing the piston and hence the crank.

The energy needed to vaporise the water is taken from thermal energy from the combustion of fuel, so it lowers the temperature in the combustion chamber. In gas turbines, this means a further benefit because less exotic materials and cooling air reduction results. It does change the emissions though. Some increase whilst other species decrease.

I know this technique is used on some 'exotic' gas turbines and some of SAAB 99 turbo's. This site mentions its use in racing engines.

Personally, my gut feel regarding the drop in fuel economy I see (it only has to be sub 7 Celsius before it is noticable) is because of factors such :

• the engine temperature never reaches the summer temperatures on my 20 mile typical journeys, meaning that oil viscosity is a little higher, more internal engine drag and smaller clearances (thermal expansion) on moving parts.
  
• I think the main hit however comes from the increased fuel viscosity changing the injector fuel spray pattern. The diesel engine efficiency and emissions is sensitive to this.
  
• Lower tyre pressures (because the air inside them is cold and contracts a little)
  

Anyway, I've never it noticed it so much on my other cars as I have in my CR-V.

You arsked the quessy RockyPops, so you gets the answer!

As you know, or even if you didn't, I keep meticulous records (=anal) of all what my Yeti contrives to confound me with, and for this, on the sixth of the tenth in 2010 I filled it up to the brim with 57.20 litres, costing £68.75 pees, too.

At that stage, on summer tyres, it returned46.34 mpg.

Next most was 54.53, and a number of them around that mark. And a 55.21 too.

And at no time did I contaminate my footware with excess fuel in my exuberance.

I see you are calculating MPG to 2 decimal places. How are you calculating the distance? From the trip meter (think of the errors induced by tyre wear, pressure, tyre expansion due to temperature etc) or via a differential offset GPS? Your error stack up must be more than 2 decimal places surely so no point in recording to 2 decimal places? (just to let you be a bit more anal )

I just fill it up, stop when it clicks, swear when I have to pay and then jump in and thrash the 1.8TSi again....

I just fill it up, stop when it clicks, swear when I have to pay and then jump in and thrash the 1.8TSi again....

.... that's the way to do it !

I see you are calculating MPG to 2 decimal places. How are you calculating the distance? From the trip meter (think of the errors induced by tyre wear, pressure, tyre expansion due to temperature etc) or via a differential offset GPS? Your error stack up must be more than 2 decimal places surely so no point in recording to 2 decimal places? (just to let you be a bit more anal )

I just fill it up, stop when it clicks, swear when I have to pay and then jump in and thrash the 1.8TSi again....

Aaaaaaaaaaargh! More work. More pressing calculator buttons. Grrrrrrr.

And of course you are correct. I've usually with stuff like this (as with blood test results on patients) use them not as the holy grail of accuracy, but of an indication, of trends, and of changes.

Incidentally Anzio asked ( or was it Brisky) about the changes in mpg with the weather. Well my system, such as it is (!!) shows quite definitively a drop in consumption with the temperature. Both March, and now May have shown better fuel figures by quite a margin, whil April fell back. And there was one time recently when we had only 2-3 days of frosty mornings, but enough to reduce the mpg figures.

Meanwhile I will still, because that's what the App does, continue with hundredths of whatevers! Thanks for the advanced maths and mechanics lessons!!!!!!

Deputy,

you aren't an accountant or a statistician are you?

Deputy,

you aren't an accountant or a statistician are you?

Chartered Engineer and spent many years working for Toyota! They would have put a team of hundreds on any calculations!

I'm an economist according to my first degree ... so my sums never add up!

I've just checked my Spiritmonitor and I've never put more than 50 litres in! I tend to fill up long before the light comes on. Up to the first click and then a bit more until the money amount is a round number. So when a less savoury specimen once put £7,56 worth of fuel in his car on my cloned bank card, the bank phoned me asking if it was me!!! I said nope since I would never put that amount of fuel in - both in how miniscule an amount it was and in terms of it not being rounded. It would have been £8 had it been me.

It doesn't help when, as I did yesterday, I got some coupons from Shell Drivers Club to get extra points over the next month for each 15L fill.

I'll have to stop four times over the next two weeks or so and top up with 15L each time or pay one visit and walk back & forth three times to get 3 x 15L in.