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.

My old tyre is 200 now the new tyre workshop say need to put 220. How much you increase bro ?

Yeah man a bit regretted for changing it to cheaper brand but no choice due to current situation kena pay cut so have to save here and there. Tyre size didn't change I just change to cheaper China made brand instead of Goodyear.

Ugh unknown China cheapo brand but nonetheless should not cause such drastic drop in fuel consumption. I suggest you recheck the tire pressure yourself at the fuel station then observe again for several rounds of full tank (not just simply fill up rm50). Measure properly by resetting the trip meter to zero everytime you pump full then drive until fuel warning light turn on then see how far you travel. My suspicion is tire pressure too low and you didn't measure properly but just by feel which is inaccurate.

Btw what car do you drive, what tire size and how much did you pay for that China cheapo tires??

I will say is personal preference and depends on pump at Petro Station. You will find out you pump same psi but different pump different result.

Personally i pump up to 34 psi front, 31 psi back, way higher than 200. 200 is soft and conform, but for my car (old Persona) is just too heavy.

I would say you can increase a bit first maybe 220 kpa, then try few days if not enough increase to 230, 240 until you find the pressure you like. But of couse don't exceed the maximum pressure as listed on the tyre, which i don't think so, as most tyre maximum pressure is above 40 psi.

Good luck, bro.

old tayar botak, botak less grip, less grip means less friction, less friction means care use less petrol to move.. on the flip side, less grip means higher chance of accident on wet road

Most probably just a placebo

Hi bro. I am driving a Persona 2014 and the cheapo tyre cost 110 per pcs. Noted on your advice. Thanks

200 or 220 is a bit too low for most typical passenger car tyres , more so if fuel consumption or sluggishness is of concern to you .

Give yourself up to 260-280 to 'feel' the improved fuel economy , never mind tyre brands .

Hi bro, yeah I am driving Persona now and will try according to your advice. Thanks man

I would have think that also. Will play around with the tyre pressure thanks man

Will definitely try that thanks man.

Welcome, bro. You may try up to 260 or above as per zeng mentioned. Until you feel too bumpy then just reduce a bit, that should be the best then.

My is 2011 Persona

Will try that thanks man for the advice appreciate it.

Wah really damn cheap, scary cheap almost like used tire price. I personally would rather buy used tires but good ones than these unknown cheapo but most people don't know how to check hence not an option for them. Anyway understandable in this difficult times, many loose jobs or get pay cuts so need to try save as much as possible. Just be mindful when driving coz usually these cheapo tires have horrendous grip especially in the wet. Drive safe.

No lah, most car std recommended pressure is around 190-230. My Evo and Swift only 220 front and 200 rear. My heavy Mark X only 230-240 max. 260-280 is already too hard for most cars unless you like harsh uncomfortable ride. Too high pressure like that also lose grip and too nervous in the wet. Persona is also a light car, no need such high pressures, at most should be just 220-230.

Hi bro, will try that thanks for the advice man

Just don’t over or under inflate your tires. Anything over 240 for a passenger car such as the persona would be overkill and that’ll wear out the center lines much faster.

dude, i think Headway is a more gripper type tayar, thats why your FC is increased.
thats the characteristic of this tire.

this one from shopee, but for vellfire one la ....

did anyone mention roll resistance & treadwear?
this two affect yo

don't follow tayar shop "recommended" tyre pressure,
they will pump lesser air to your tyre so your thread gone faster.

follow the Tyre pressure sticker at the side of driver pillar.
every time i go service my car, the tyre pressure always less 4 ~ 6 Psi then recommended one.

From this photo it seems the tyre is not efficient in terms of fuel consumption. It could be one of the reason the price of tyre is cheap (on top of branding and country origin). There is a misconception in relation to how efficient the tyre (rolling resistance) and how grippy (performance on wet/dry and braking/ cornering). There is a relation but some of the better tyre model is able to reduce rolling resistance(Fuel efficient) while maintaining performance (grippy) rather than the obvious (of the notion that the better performance tyre tend to have poorer efficiency).

Case in point Goodyear efficient grip might be more fuel efficient, but performance might equal or better than headway. Or Michelin PS4 might have better fuel efficiency than headway but also better performance. But PS4 efficiency will be worse compared to Michelin primacy 4, with reduced performance. Obviously price point is another factor in the overall choice of a tyre and each their own in their picks to balance out which is better from their budget based on total lifetime of tyre and extra fuel needed during that lifetime plus cost of tyre.

Balancing is another point, the assumption is the shop did a fine job in both alignment and balancing but do recheck. How is the vibration during drive? If the car is old, maybe need to check the front and rear suspension mount too if there is some play (they sit on a rubber mount and it will degrade, causing some play during drive and induce excess vibration). Might not relate a lot to your fuel consumption directly but alignment will run causing excess tyre wear, and extra rolling resistance.

There is an outer coat on all new tyres. This reduces the grip and performance of tyres. Thus, explains why you have low mileage on new tyres. You need to drive for approx 300km to run in your new tyres. Grip, handling, mileage and etc will improve after that. Correct air pressure is important too.

I always go to a petrol station to reduce air after changing tires. No jokes... almost all tyre shop will over inflate for no reason.

Different tires do affect fuel consumption because it also affect driving style.

Majority of tyres sold in Malaysia has a maximum pressure rating of 51 psi .
Hence most are them are recommended by tyre manufacturers for operating pressures as high as 44 psi and speed as high as 220 km/hr .
Generally tyres are over-spec'ed for day to day use .
IMHO, over-inflate from vehicle OEM recommended 29/32 psi to 40-44 psi say, is well and good within spec but over-pressure up to pressures higher than 51 psi is NOT .

This post has been edited by zeng: Sep 12 2020, 08:21 PM