I've now accumulated enough data to confirm that the mpg I get when the temperature falls below 10 degrees is significantly worse than when it is warmer.

I use an App called FillPro on the iPhone and it is possible (as I found out by chance!!) to scroll left to right and get a moving rolling 3 month average. It is also possible to do it in 1 month bites, but the three month choice illustrates it more graphically.

In the really chilly times my 170 mileage falls to about 42, and in the warmer months that climbs to just under 45mpg.

My travelling over those 3 month segments is pretty uniform, so it is my belief that the information is reliable.

The worst 3 month average was last December through to end of February where it plunged to 41.4mpg, and the best was 45mpg over four months July to October 2010. Interestingly, April this year was really quite warm - and the mpg again hit 45.1, falling back over the rest of the "summer" to 44.1. And for the last 4 weeks it has again dropped to 42.3!

Today I made the decision - and had the Yeti fitted with 4 new Winter Continentals at an eye-watering price that my keyboard refuses to print on here. I will be interested to see how this affects fuel consumption. And many thanks to Sinclair Skoda who squeezed me in at just a day's notice to do the job, and who will store my two serviceable Dunlop SP1s until I change back next year. They even gave me a decent discount on the Winters, too.

And as it is useful to say after a post like this - "It just lets you see what it shows you!"

Compliments of the season to all readers.

I've noticed, both on Dewi and the previous Freelanders, that my consumption drops by between 5 and 10% once the temperatures drop. I suspect because it takes the engine longer to warm up, plus wnds are generally higher.

Not a lot you can do about it, other than hibernate I suppose. :yes:

Glad Sinclair's are looking after you and your tyres. That is a good service.

Nadolig Llawen a Blwyddyn Newydd Dda

Nadolig Llawen a Blwyddyn Newydd Dda

Nadolig Hapus i chi :giggle:

Seasons Greeting to Freshacre and all other Briskodians.

Just to add that winter diesel doesn't seem to help with fuel economy either.

Elsie was only doing about 23mpg earlier, but my average speed at the time was 5mph

which probably explains it

Seen this same pattern in my other car; a Ford TDCI over the last three years - it averages 49mpg in town throughout the summer and then settles to around 44mpg every winter, doing exactly the same daily journey!

I have similar experiences, but nowhere near as well documented. Remember to increase the tyre pressure by about 0.2 bar over what you normally use in summer.

Since I rarely have passengers or any significant load in the back, I run 2.3 all round in summer and 2.5 all round in winter. The wear pattern seems to confirm that this is close to optimal - no significant differences in wear across the tyres, but a slight rounding over of the outside edges in front.

Switching back to front at each season change evens the wear and seems to indicate 2½ summer seasons and 3 or 4 winter seasons per tyre set. I drive around 20,000 km in summer and 10,000 in winter.

Best wishes to all for the upcoming holiday season.

Jesper

On diesels, winter mileage drops because diesel fuel is diluted with gelling preventers (e.g. kerosene) and has 5%-10% less energy content per litre.

Generally larger rolling resitance of winter tyres may affect fuel consumption, but quite a few people go from wider summer tyres to narrower winter tyres and actually gain some fuel economy back thanks to contact patch size decrease.

Still, winterized diesel seems to outweigh any savings. I also find around 5%-7% higher consumption in winter time.

Edited 16 December, 201114 yr by dieselV6

Am I right in saying (might not be) that in winter the power output can increase due to colder air being forced into the engine by the turbo!

Yes, but it is counteracted by worse winter fuel that does not heat up the air in cylinder up as much as in summer. Net result is power decrease, not increase.

On summer nights, my Superb can do 242km/h on autobahn flats. Never managed to exceed 233km/h in winter. This works out to about 15bhp-20bhp less in winter than in summer, though slightly higher winter tyre rolling resistance probably accounts for some of the loss.

Edited 16 December, 201114 yr by dieselV6

Hi

Just got back from a Ceilidh gig for an 18th birthday in Reading - brilliant kids, cos the danced their socks off, and were completely knackered by the end! We'd expected them to be a bit "shy" and look on it as "not cool", but all of them, and especially the boys, were up for some serious Strip the Willow amongst other energetic stuff.

Anyhow - the point of this posting is that my journey home - 158 miles starting 23.06 ending 01.59 - at an average speed from Maxidot of 56mph - returned the ruddy awfully unbelievably bad 39.1mpg!

THIRTY-NINE POINT ONE miles to the gallon. Harrumph, he said, with feeling, because more than half of my "fee" for plonking my bass guitar, or stroking my lovely Vintage Rock'n'roller in time with the tunes, will go on the ruddy fuel.

I sidestepped neatly onto the M4, having doe-se-doed the ice off the screen, finger-flicked the cruising control to an indicated 73mph, and, wafted along smoothly on the adrenaline from a great gig heading for my little pie in the sky near Brecon.

No hysterics from the Yeti, no hills to polka upwards, no wind (externally - on the car... ...) BUT - there was LOADS of lows of 1 degree, 2 degrees, zero degrees, and up in the 'ills there was some nice glittery road surfaces to admire which if one trod indelicately upon the brake pedal induced a Yeti-rattling, inmate-shoogling feeling of the ABS kicking in.

And at the final ascent to Chez Freshacre (and greeted by a starving, freezing kitten who has adopted me, and doesn't understand about gigs 150 miles away) I was very nearly flat on my backside when alighting. Sheet ice on the parking spot.

So - was it the low low temperatures - which really were not that low, or was it the winter Conti Conti tyre tyres that reduced my mpg by so much? This is a journey I have done oodles of times this year, with full kit in the boot, back seats, floor, front seat and foot-well and always always always before I have managed to get an indicated 44mpg. (Why, oh why are all our gigs so far from home, eh?)

Hmmmm. thought I'd had a nice bonus just before the holidays, and not just a refilled Yeti tank.

G

Hi

Just got back from a Ceilidh gig for an 18th birthday in Reading - brilliant kids, cos the danced their socks off, and were completely knackered by the end! We'd expected them to be a bit "shy" and look on it as "not cool", but all of them, and especially the boys, were up for some serious Strip the Willow amongst other energetic stuff.

Anyhow - the point of this posting is that my journey home - 158 miles starting 23.06 ending 01.59 - at an average speed from Maxidot of 56mph - returned the ruddy awfully unbelievably bad 39.1mpg!

THIRTY-NINE POINT ONE miles to the gallon. Harrumph, he said, with feeling, because more than half of my "fee" for plonking my bass guitar, or stroking my lovely Vintage Rock'n'roller in time with the tunes, will go on the ruddy fuel.

I sidestepped neatly onto the M4, having doe-se-doed the ice off the screen, finger-flicked the cruising control to an indicated 73mph, and, wafted along smoothly on the adrenaline from a great gig heading for my little pie in the sky near Brecon.

No hysterics from the Yeti, no hills to polka upwards, no wind (externally - on the car... ...) BUT - there was LOADS of lows of 1 degree, 2 degrees, zero degrees, and up in the 'ills there was some nice glittery road surfaces to admire which if one trod indelicately upon the brake pedal induced a Yeti-rattling, inmate-shoogling feeling of the ABS kicking in.

And at the final ascent to Chez Freshacre (and greeted by a starving, freezing kitten who has adopted me, and doesn't understand about gigs 150 miles away) I was very nearly flat on my backside when alighting. Sheet ice on the parking spot.

So - was it the low low temperatures - which really were not that low, or was it the winter Conti Conti tyre tyres that reduced my mpg by so much? This is a journey I have done oodles of times this year, with full kit in the boot, back seats, floor, front seat and foot-well and always always always before I have managed to get an indicated 44mpg. (Why, oh why are all our gigs so far from home, eh?)

Hmmmm. thought I'd had a nice bonus just before the holidays, and not just a refilled Yeti tank.

G

Hi

Just got back from a Ceilidh gig for an 18th birthday in Reading - brilliant kids, cos the danced their socks off, and were completely knackered by the end! We'd expected them to be a bit "shy" and look on it as "not cool", but all of them, and especially the boys, were up for some serious Strip the Willow amongst other energetic stuff.

Anyhow - the point of this posting is that my journey home - 158 miles starting 23.06 ending 01.59 - at an average speed from Maxidot of 56mph - returned the ruddy awfully unbelievably bad 39.1mpg!

THIRTY-NINE POINT ONE miles to the gallon. Harrumph, he said, with feeling, because more than half of my "fee" for plonking my bass guitar, or stroking my lovely Vintage Rock'n'roller in time with the tunes, will go on the ruddy fuel.

I sidestepped neatly onto the M4, having doe-se-doed the ice off the screen, finger-flicked the cruising control to an indicated 73mph, and, wafted along smoothly on the adrenaline from a great gig heading for my little pie in the sky near Brecon.

No hysterics from the Yeti, no hills to polka upwards, no wind (externally - on the car... ...) BUT - there was LOADS of lows of 1 degree, 2 degrees, zero degrees, and up in the 'ills there was some nice glittery road surfaces to admire which if one trod indelicately upon the brake pedal induced a Yeti-rattling, inmate-shoogling feeling of the ABS kicking in.

And at the final ascent to Chez Freshacre (and greeted by a starving, freezing kitten who has adopted me, and doesn't understand about gigs 150 miles away) I was very nearly flat on my backside when alighting. Sheet ice on the parking spot.

So - was it the low low temperatures - which really were not that low, or was it the winter Conti Conti tyre tyres that reduced my mpg by so much? This is a journey I have done oodles of times this year, with full kit in the boot, back seats, floor, front seat and foot-well and always always always before I have managed to get an indicated 44mpg. (Why, oh why are all our gigs so far from home, eh?)

Hmmmm. thought I'd had a nice bonus just before the holidays, and not just a refilled Yeti tank.

G

Hi

Just got back from a Ceilidh gig for an 18th birthday in Reading - brilliant kids, cos the danced their socks off, and were completely knackered by the end! We'd expected them to be a bit "shy" and look on it as "not cool", but all of them, and especially the boys, were up for some serious Strip the Willow amongst other energetic stuff.

Anyhow - the point of this posting is that my journey home - 158 miles starting 23.06 ending 01.59 - at an average speed from Maxidot of 56mph - returned the ruddy awfully unbelievably bad 39.1mpg!

THIRTY-NINE POINT ONE miles to the gallon. Harrumph, he said, with feeling, because more than half of my "fee" for plonking my bass guitar, or stroking my lovely Vintage Rock'n'roller in time with the tunes, will go on the ruddy fuel.

I sidestepped neatly onto the M4, having doe-se-doed the ice off the screen, finger-flicked the cruising control to an indicated 73mph, and, wafted along smoothly on the adrenaline from a great gig heading for my little pie in the sky near Brecon.

No hysterics from the Yeti, no hills to polka upwards, no wind (externally - on the car... ...) BUT - there was LOADS of lows of 1 degree, 2 degrees, zero degrees, and up in the 'ills there was some nice glittery road surfaces to admire which if one trod indelicately upon the brake pedal induced a Yeti-rattling, inmate-shoogling feeling of the ABS kicking in.

And at the final ascent to Chez Freshacre (and greeted by a starving, freezing kitten who has adopted me, and doesn't understand about gigs 150 miles away) I was very nearly flat on my backside when alighting. Sheet ice on the parking spot.

So - was it the low low temperatures - which really were not that low, or was it the winter Conti Conti tyre tyres that reduced my mpg by so much? This is a journey I have done oodles of times this year, with full kit in the boot, back seats, floor, front seat and foot-well and always always always before I have managed to get an indicated 44mpg. (Why, oh why are all our gigs so far from home, eh?)

Hmmmm. thought I'd had a nice bonus just before the holidays, and not just a refilled Yeti tank.

G

4 Gigs in one night....awesome

4 Gigs in one night....awesome

You obviously haven't met "Super George"!!

There is even some stuff of him playing on You Tube!!