Hi all sifu,

May i know do you all experience before your car feels under power after replace all 4 new tires?
Recently i change my car all 4 new tires but after that my car feels under power and with old tires Rm50 petrol can go up to 380KM but now only can go about 300KM after replace 4 new tires. I tried to google online for an answer but couldn't find one. Appreciate any advice what's wrong ? thank you.

This post has been edited by fiberguy: Aug 19 2020, 08:14 AM

Did the tire size change at all?

I've heard some tires being advertized as fuel saving (specific patterns reducing resistance, etc) but surely not to that much difference.

Maybe alignment isn't done correctly. Either too much toe-in or toe-out which explains why your car feels under power and you're getting less mileage.

https://www.quora.com/How-is-toe-in-toe-out...-in-automobiles

not enough air?

Are the new tyres more grippier than the previous set?

Higher traction tyres can increase a bit fuel consumption.

Trade off for better road handling performance.

No sir, i replace back the same size but different brand.

the alignment done nicely after replace new tires, currently it won't swing to one side. What is toe- in and toe-out ? is it means swing to one side when driving ?

hmmm not really sure about gripping but with new tires handling is much better now.

OK.... from what tire to what tire (brand/series)

Amount of air pressure. The more rubber sticks to the floor the more power you need and more traction.

cannot be tyre problem. even if you change 2 size up it wont be so much difference.

Different series different brand has different tire characteristic. Some tires have softer sidewall and some harder. Even if you put same air pressure, the one with softer sidewall will bulge more thus the overall diameter of the tire is less than the harder sidewall.

With smaller diameter, the tires need more rotation to go the same distance compare to the other tires leading to more fuel used. The more contact, the harder to roll, adding another factor. Another possibility is that you are comparing your old end of life tire with new one.. The old tires lost probably about 2.5 cm of radius, thus this contributes to at lease 3% of fuel consumption increment.

from Goodyear to Headway (china brand) due to no budget have to change cheaper one.

according to the tyre shop the air pressure is recommended

salute to your sir, very professional advice. Your maths is awesome.

any advice what is wrong ?

interesting, but I think you now had to make more funds to change to another brand?

any how need to check to see if any one can advice if this is related to the cheap tyre or other problems.

I have the same feeling. I just change few days ago. New tire feel softer but heavier.

Maybe is just too new and the air pressure different. I increase a bit more pressure to get back my feel.

I am not sure if lesser known brands or tyre size can increase fuel consumption until almost 30%.

Unless those tires are really heavy increasing your unsprung weight + tyre pressure + ineffective traction.

If this is the case then saving on cost of tyre is really not effective as the consumption is up by 30% and multiply that by 2-3 years of lifespan. You will be paying more.