Fuel consumption goes up after changing tires

[Sash1401]

Fellow bros,

 

my car fuel consumption goes up ever since i've changed tires... my previous tires were hankook while i've changed all 4 tires to perelli... does the increase in fuel consumption haf anything to do wif the new tires? or is there anything i need to take note of? pls enlighten mi...

 

Btw. the tires that i've changed r all to the previous specs of my old tires... so there is no change of size in my new tires

 

thanks

Edited October 5, 2009 by Sash1401

[Kyojin]

how long have you had them on? new tyres tend to be "slippery" from the layer of coating.

 

also, construction material plays a part. I'm not sure which tyres you have exactly, but if you went from an "eco" or High Performance Tyres to Ultra-High Performance or semi-slicks then your rolling-resistance will increase. if the material is softer, your RR will increase too.

 

tyre pressure? is it the same as your Hankooks?

 

there are many factors. but i would safely say it's due to the material.

[Boyboy]

what model of new and old tires? grippier tires tend to give poorer FC i believe.

 

newer tires will have larger diameter by abit even for same specs. older tires worn mah, diameter reduces slightly. thus u are travelling less than ur odometer reports. this gives u better PERCEIVED mileage.

 

ur new tires may be giving u what ur odometer reports. if u calculate actual distance travelled (u need GPS for this), then u may find that mileage is actually the same, not worse, on the new tires.

[Sash1401]

thanks fellow bros for ur valuable advise... i'm not sure abt the material of the tires though... i juz went to autobac to change when it's quite worn out on my old tires... in fact i've been using the new tires for the past abt 2 mths, but found my consumption getting higher... check my engine oil for fear of level dropping n dis will cause consumption to go up, but level remain the same tats y i'm thinking if the new tires r causing the raise in consumption...

 

bro, for the diameter, will it get to the diameter of the old tires when its more worn? i guess it will rite? from wat i saw, the new tires r slightly bigger than the old ones though the specs r the same...

[Kyojin]

just how much is the FC increase?

 

[Townegg]

i change from Yokohama Aspec 185/65R14 to Bridgestone RE001 195/55R15 and my fuel consumption drops about 0.5 to 1km/l on average? No matter how light i step i can never get back the previous km/l per tank before i change tyres.

 

so i think this is possible especially from economy tyres to performance tyres? but if both your old and new tyres are eco tyres then the difference may not even be significant?

[Niltrams]

U upsize rims of course increase FC la....

[Xiao_qiang]

I have the same problem..

Same rims, same air pressure and same tyre profile..

 

I was on Yoko DB earlier and changed to Hankook RS/2..

My FC dropped from abt 630km/tank (average) to about 560/tank..

 

I guess it does make a difference when you use High Performance Tyres as compared to comfort..

[Hungee]

I have the same problem..

Same rims, same air pressure and same tyre profile..

 

I was on Yoko DB earlier and changed to Hankook RS/2..

My FC dropped from abt 630km/tank (average) to about 560/tank..

 

I guess it does make a difference when you use High Performance Tyres as compared to comfort..

 

Maybe one is comfort tyre, the other is more performance type. Though same size/profile, but I guess performance type will affect FC more cos of better grip

[Mzrmazda3]

Maybe one is comfort tyre, the other is more performance type. Though same size/profile, but I guess performance type will affect FC more cos of better grip

 

You are right Bro

 

Performance tyre will grip more to the ground which results in slightly higher FC & noise level as compared to ECO, quiet tyres which tends to have lower gripping power & of course will have lower noise level

[Watwheels]

Aiya. The reason is that if you were to compare an almost worn out tire vs a fresh tire with the same rims, the overall diameter of the almost worn out tire is smaller. With a smaller wheel dia. you get better acceleration and improved FC. And as you drive you will find that the FC for the fresh tires is slowly improving cos the outer dia of the tire is gradually wearing out.

 

That's why when you switch from a nearly worn out tire to a fresh tire, the sudden increase in your wheel's diameter, you find that the FC has increased.

Edited October 6, 2009 by Watwheels

[Yeobh]

New tyres have higher rolling resistance and therefore engine will have to work slightly harder. Try increasing the tyre pressure by 5%

Edited October 6, 2009 by Yeobh

[Throttle2]

unless the consumption increase is truly sigificant, why bother?

 

more important that tyre grip is better.

[Tofushop193]

coumpound softer?more grip?

[Paddie]

New tyres have higher rolling resistance and therefore engine will have to work slightly harder.

 

How come new tyres will have higher rolling resistance? I don't understand.

[Leepee]

Maybe the new tyre is quieter and more grippy, so your driving style has being influenced by it, and you drive more argresively subsconsciously.

Or unlucky, the tyre fitter damaged your break pad(sticking) or bearings, which caused your higher fuel consumption.

 

[Sash1401]

my consumption increase by abt 1km plus.... from 13 plus close to 14 now become juz over 12... i'm not sure if the new tires r high performance tires but i do noe my previous tires from hankook do wear out quite fast... when i did a rotation and after 10km of travelling, i can c that the front tires(which r previously from the back) become quite worn off and some markings r worn off too...

[GoodCar]

Your car need to do wheel alignment or not?