Thought my last tank full was lasting longer; ran to 455 miles before filling up. She took 44 litres to the click with a bit more to round it up for my 5p off Tesco voucher This equates to 47mpg according to fuelly and the best figure to date. She is however on steel wheels with 215/60 Hankook W310 winters at 2.4 bar.

Been regularly recording 52 to 54 mpg on the Maxidot during this period.

TP

Hi Tim

Never get round to doing the fill to fill, but the 110 is telling me the average from new is now 47mpg.

Swmbo took this picture a few days ago showing 63.1mpg and it had dropped from 65mpg as she was getting her phone out of her handbag (you know how long it take them to find things in there) very pleased with the 110 mpg.

I was looking for a suitable thread to report my discovery over the last 2 weeks. Two weeks ago on a suitable cold day on a suitable calendar date I changed to winter tyres (215/60R16 on steel wheels). The inevitable happened and despite being in the North UK it has since been warm - even the roses are blooming.

Anyway I have been doing my familiar journeys and have been taken aback by something very unexpected. Our weekly trip to Aspatria which is on on A roads together with an urban section right through Carlisle usually returns 47mpg on maxidot (about 43mpg when brimmed). Now that journey shows 57mpg on maxidot - never ever recorded that on any journey before. My short runs into town normally show about 42mpg on maxidot now show 50mpg and even my very short (2 mile) runs to village shop before car has even warmed up show a marked improvement. It can only be the winter tyres unless the engine has "coughed" and decided to show better mpg all of a sudden. My driving habits have not changed - with me pushing along A roads at 60mpg etc.

Car is 170 Yeti and the winters are a 2.4 bar.

I was looking for a suitable thread to report my discovery over the last 2 weeks. Two weeks ago on a suitable cold day on a suitable calendar date I changed to winter tyres (215/60R16 on steel wheels). The inevitable happened and despite being in the North UK it has since been warm - even the roses are blooming.

Anyway I have been doing my familiar journeys and have been taken aback by something very unexpected. Our weekly trip to Aspatria which is on on A roads together with an urban section right through Carlisle usually returns 47mpg on maxidot (about 43mpg when brimmed). Now that journey shows 57mpg on maxidot - never ever recorded that on any journey before. My short runs into town normally show about 42mpg on maxidot now show 50mpg and even my very short (2 mile) runs to village shop before car has even warmed up show a marked improvement. It can only be the winter tyres unless the engine has "coughed" and decided to show better mpg all of a sudden. My driving habits have not changed - with me pushing along A roads at 60mpg etc.

Car is 170 Yeti and the winters are a 2.4 bar.

Is the rolling radius the same? Speedo and mileage may be out significantly with different wheels and tyres fitted?

Is the rolling radius the same? Speedo and mileage may be out significantly with different wheels and tyres fitted?

This is what I was assured would be the issue when I posted similar to the above last winter after just swapping over to my winters. :yes:

On the Maxi Dot in our VW Golf there is a winter tyres setting where you can adjust up and down 5 or 10% to compensate for difference, is this option in the Skoda ME.

Is the rolling radius the same? Speedo and mileage may be out significantly with different wheels and tyres fitted?

For me everything is the same as she's factory set-up on 215/60 tyres think the winter option has improved things by about 1mpg.

On the Maxi Dot in our VW Golf there is a winter tyres setting where you can adjust up and down 5 or 10% to compensate for difference, is this option in the Skoda ME.

Sadly not on the Yeti anyway; only get an option to set a max speed warning for lower rated tyres :S

TP

Is the rolling radius the same? Speedo and mileage may be out significantly with different wheels and tyres fitted?

From reading the various winter tyre threads the rolling radius is very slightly but not significantly different - I now have 215/60R16 on 16" steel wheels as opposed to the standard Summer 225x50R17 on 17 inch alloys. I didn't think that would make a vast difference to apparent mpg readings (??). ASAP I'm going to check my speedo with satnav to compare. On the summer wheels it showed 74mph at a true satnav 70mph.

See this post for sizes:

http://briskoda.net/forums/topic/217147-black-winter-wheels-finally-going-silver/page__view__findpost__p__2572475

Your new tyres are only 1,2% bigger so should not account for such a huge difference in mpg readings in my book...

See this post for sizes:

http://briskoda.net/forums/topic/217147-black-winter-wheels-finally-going-silver/page__view__findpost__p__2572475

Your new tyres are only 1,2% bigger so should not account for such a huge difference in mpg readings in my book...

Yes - I have been reading that thread (and others). Thanks for your confirmation of my thoughts. I can only surmise less rolling resistance and less weight of wheel (I think) making some contribution to this sudden and quite dramatic difference. Oh - I increased their weight slightly today on receipt of VW caddy wheel centre caps like yours - off fleabay - thanks to your various very useful writings on this subject of steel wheels. Unlike you I think I will swallow pride and keep their VW logos !!

I will confess to the winter tyre manufacturer reluctantly. Many people (on some none Skoda forums) seemed to find them quite good and I do very little mileage in winter and keep well away from any limits but with this effect on my motoring only fair to confess. They are Nankang.

Some cars also have an increase in drag coefficient when larger wheels with wider tyres are fitted.

This is reflected in slightly poorer official CO2 ratings,although this doesn't seem to be the case with the Yeti ?

Some cars also have an increase in drag coefficient when larger wheels with wider tyres are fitted.

This is reflected in slightly poorer official CO2 ratings,although this doesn't seem to be the case with the Yeti ?

Erm, the Greenline does have a lower Cd figure due to the smaller frontal area (it is lower) and smaller tyres. So yes, putting 205/55 tyres on might have the same effect as your car is lowered by nearly 4%... BUT the people above put the 215/60 tyres on raising their cars by 1,2% surely giving them a WORSE Cd figure since they increased their frontal area?

TPs thread seems to have taken a change in direction. :wonder:

The actual change between 225/50/17s and 215/60/16s is 7mm in diameter and this represents a 1.07% increase or in other words the diameter change roughly equates to the difference between a new set of tyres and a half worn set.

The winter tyre setting on Maxidot does NOT alter the speedo calibration or mileage recording on the Yeti as others suggest.