Vreidstein Ultrac Vorti bad choice - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 03-20-2016
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Vreidstein Ultrac Vorti bad choice

I thought I would have a change from my usual Pirelli tyres and chose Vreidstein Ultrac Vorti for my R172 SLK55 AMG. Bad choice .


My mpg (UK gallons) has gone down from 35 / 36mpg on a long run, say 50 miles plus, has gone down to 27 / 28mpg, with the cruise control set at 70mph, and round town I am lucky if I can get 20mpg. Can't wait for next tyre change.


At this rate I won't be able to keep the 55the choice is petrol or food.
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#2 Old 03-31-2016
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Have to say thats a tyre that i have never considered. What made you choose it?


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#3 Old 04-01-2016
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Did due diligence by going on some of the German tyre test reports and it got a good write up, near the top in most categories except aquaplaning. So it seemed to be a reasonable replacement for the factory Pirellis, big mistake.


How is your son doing, in the Yorkshire First Team yet?


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Have to say thats a tyre that i have never considered. What made you choose it?


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#4 Old 04-01-2016
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A 20% increase in fuel consumption just by using another brand of tires? That's an awful lot, never heard of such a large difference.
Sure that it can't be anything else? Same size as the previous ones? Tire pressure correct? Correct fitted, i.e. not inside out?
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#5 Old 04-01-2016
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Originally Posted by Cookiecrew View Post
Did due diligence by going on some of the German tyre test reports and it got a good write up, near the top in most categories except aquaplaning. So it seemed to be a reasonable replacement for the factory Pirellis, big mistake.


How is your son doing, in the Yorkshire First Team yet?
He is 14 now, growing like a weed and progressing through the age group Yorkshire schools cricket. :-)


Vredestein Ultrac Vorti | UK top tyres rated | Auto Express

Vortis came 8th on this test above Pirelli Pzeros.


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#6 Old 04-02-2016
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Not good is it


I checked on relatively long runs, say 100 mile round trip, several times, (Teesside to North of Newcastle) to make sure engine is warm and drove at a steady 70 on cruise control on the A19, which is gentle rolling hills. and over the A66 from Teesside to Penrith. I really struggled to even get the 27 - 28 mpg. I notice that in the Auto Express link that Ram has posted that they say the rolling resistance is high, but they only got a 5% reduction in mpg.


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A 20% increase in fuel consumption just by using another brand of tires? That's an awful lot, never heard of such a large difference.
Sure that it can't be anything else? Same size as the previous ones? Tire pressure correct? Correct fitted, i.e. not inside out?


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#7 Old 04-02-2016
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Try to get a set of different wheels, make a swap and test. 20% (I didn't check the match!) is impossible unless you have square wheels like those:

I think that your tyres have fuel efficiency mark "E".

"The difference between an A rating and a G rating could mean a reduction in fuel consumption of up to 7.5%."

https://www.goodyear.eu/en_gb/consum...explained.html
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