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Tyres for better fuel consumption

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I own an Auris 2014 Hybrid. I drive on 225/45/R17 and my overall consumption is 4,7 l/100 km. I believe that if I had 195/65/r15 91H tyres, the consumption would be lower for 0,5  litres almost. What is your opinion about that issue ? Is anyone out there had changed the dimensions like above? 

Thank you

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Moved to the Auris club

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Hi and welcome . You can’t change to 15” wheels because of the front brakes callipers size, smallest possible size that you can fit is 205/55 R16 , but in my opinion don’t change anything, just get quality tyres that are rated for low rolling resistance and quiet , Good Year Efficient Grip Performance are good example or  Kumho Ecsta HS51 if you are on a budget, and most importantly is to keep them to the right pressures, not much above or below max allowed . 

 

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I agree with TonyHSD and think the quallity of the tyres probably are more important than just size.

I swaped my orginal 225/45/17 91W Dunlop Sport Fastresponce ( E rolling resistance B wetgrip 69 sound in EU marking) on my Auris TS HSD 2014 for some used 205/55/16 91W (F rolling resistance C wetgrip 71 sound ) cause I was convinced that it would be better for fuel consumption and (ride) comfort but... there wasnt that big difference in neither fuelconsumption nor comfort.

Now I bought some new 205/55/16 94 XL GoodYear Efficient Grip Performance and hope for some improvement in both fuelconsumpion and comfort.

Have just driven them some 10km yet though

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I went to Goodyear Efficientgrip Performance tyres (205/55 R16) but didn't really notice any substantial difference in MPG (previous tyres were Goodyears also).

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But the manual mentions the 15 ‘’ dimensions... what about the difference between 17’’ and 16’’ ?

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On both the first and second generation Auris hybrids, 15 inch wheels/tyres were available on certain grades.

Lower profile tyres tend to be wider and have a bigger footprint - which can adversely affect fuel consumption.

As regards changing from 17 inch wheels/tyres to 15 inch wheels/tyres, one would need to be sure that the relatively small reduction in fuel consumption would justify the expense of the change. Also one would need to check with your insurer that they will accept the change, or whether they may charge additionally for the change to the car's spec.

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We have a 17" wheel Auris.  I have put 16" Toyota wheels on it.  These fit fine, but the gap between the rim and the brake caliper is really quite small.  The front brake calipers are definitely a different design, and bigger, than those fitted to a 15" wheeled Auris (which we also have).  The 15" wheels definitely don't fit over the larger brakes, I have tried, just to be certain.

When or if I get time, I will run both these cars around a short test loop to compare their fuel economy.  The cars are the same age and similar mileage, but one has done much more motorway mileage, so another known variable here beyond the less obvious ones.  I would have compared the 17" wheels to their 16" replacements from a fuel economy perspective, but there were so many other weather-related changes that it would not have been that meaningful. Also, the car is/was still freeing up after years spent with its previous driver, who was very, very careful!

The bigger brakes do have more feel than the smaller ones, but for the dreadful, crumbling, under-funded, speed-humped roads around here the 15" wheels are great, if less precise when cornering.

I noticed that back in the 2000s, you *could* buy a  3 series BMW or E-class Mercedes on 195/65 x 15 tyres, if you wanted to.   Has car comfort become less important next to performance, it seems so.  Perhaps that is one part of the appeal of some SUVs - fat tyres and a softer ride.

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On 4/11/2019 at 8:47 AM, Gerg said:

We have a 17" wheel Auris.  I have put 16" Toyota wheels on it.  These fit fine, but the gap between the rim and the brake caliper is really quite small.  The front brake calipers are definitely a different design, and bigger, than those fitted to a 15" wheeled Auris (which we also have).  The 15" wheels definitely don't fit over the larger brakes, I have tried, just to be certain.

When or if I get time, I will run both these cars around a short test loop to compare their fuel economy.  The cars are the same age and similar mileage, but one has done much more motorway mileage, so another known variable here beyond the less obvious ones.  I would have compared the 17" wheels to their 16" replacements from a fuel economy perspective, but there were so many other weather-related changes that it would not have been that meaningful. Also, the car is/was still freeing up after years spent with its previous driver, who was very, very careful!

The bigger brakes do have more feel than the smaller ones, but for the dreadful, crumbling, under-funded, speed-humped roads around here the 15" wheels are great, if less precise when cornering.

I noticed that back in the 2000s, you *could* buy a  3 series BMW or E-class Mercedes on 195/65 x 15 tyres, if you wanted to.   Has car comfort become less important next to performance, it seems so.  Perhaps that is one part of the appeal of some SUVs - fat tyres and a softer ride.

Very intressting! Please keep us informed.

Me myself have just changed to 205/55/16 94 XL GoodYear Efficient Grip Performance, A rolling resistance B wetgrip 68 sound in EU marking, (as said above) but I have to drive some more miles to get any usefull info.

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I share TonyHSD's sentiments as well. Go for car tyres that can create less wheel resistance. Also, make sure that you regularly service your car and conduct a wheel alignment check at least once per year. Basic things can help you go far!

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On 4/11/2019 at 8:47 AM, Gerg said:

...Has car comfort become less important next to performance, it seems so.  Perhaps that is one part of the appeal of some SUVs - fat tyres and a softer ride.

On the current and previous Prius, the choice was 15" or 17".

A number of people on this board and others have said they liked the 17" ones because they "looked better".

I currently own the latest (4th) Generation, and previously owned the 3rd, both on 15".  I also on occasion drove versions with 17".

Those on 17" rims were generally noisier, gave a harsher ride (although less pronounced in the 4th Gen with it's improved chassis and suspension), larger turning circle (due to 17" being wider) and cost more to replace, in addition to being worse for CO2 and emissions.  In theory, with a much smaller amount of air/rubber between metal and road, they are more susceptible to damage from severe pot holes but I've not seen a single report of this happening.

I can't recall if this also applied to the Gen 3, but on the 4 it pushed the car into a different bracket for Benefit in Kind tax (making 17" much more expensive for company car drivers) and meaning only cars with 15" got exemption from the London Congestion Charge (although it no longer matters as from this month only zero emission cars and some plug-in Hybrids qualify).

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17” wheels are better option for motorway driving especially at higher speeds and much better at cornering, I mean not driving like crazy , just normal. If most of the times the car is used in town 15” are better, but if driven mostly on motorways 17” are best. I can live with both sizes, not problems for me. Most important are the right tyres not the size. Winter time with with tyres and summer time with summer tyres preferably or all season ones. Car with quality 17” tyres can ride better than car with cheap low quality rubbers in any driving conditions. Quality tyres can vary from midd range to high end, also the type of the tyres very important. 17” at 45 profiles many of the tyres are “UH” ultra high performance tyres suitable for sportier driving styles and not good at all for a hybrid cars, many ppl don’t realise that and buying those tyres than get noisy and bumpy ride, plus worse fuel economy. Also the OEM tyres are not always the best option, despite the car came originally equipped with them, doing an extended research prior to buying a new set of tyres pays off afterwards . 

Regards 

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