Choosing small tyre for Toyota Vitz 2011

[pwuser155672155782]

Sam Pakwheelers.
Currently i am using Vitz 2011 1.0 with 186/65/15 tyre with beautiful alloy rim. I purchased it in this condition. After using it for 1 year my main concern is fuel consumption.
Previously i was getting 9.5-10.8 km/L average in city with AC. I had my Cat converter cleaned, all engine parts cleaning, plugs replacement with original ones, fuel injectors and everything related to it. Still i am getting 10-11 km/litre in city with AC on. And Around 11-11.5 km without AC.
Someone suggested me to Use steel rims 13” with 145/80/13 size to improve fuel average at the cost of reduced ground clearance.
As my main concern is fuel consumption, my question is that Can I fit this wheel in my car without any problem? Like brake size would interfere or not? Are there any major drawbacks? Is this size overall compatible?
Thanks in Advance.

[pwuser165176643628]

@hash4u
What is your tyre size and fuel average ?

[devils_smile]

You're gonna regret putting a 145 tire on your vitz. If you really want to switch, the factory size tire and wheel are 165/70R14. Either move to that or if ground clearance is an issue, switch to either 165/80R14 (or similar) or a 175/70R14. It may be a kei car but that doesn't mean you slap on a mehran tire on it and hope to see drastic improvements in fuel average.

[hash4u]

which city r u from
r u driving in extreme congested traffic and doing heavy iddling
13 rim option is in passo not vitz
vitz comes in 14 and 15 size rims oem
165/70R14 being the oem smallest size
even if you switch to it, difference might not be 0.5-1 km/ltr improvement

[pwuser155672155782]

Currently 185/65/15

[pwuser155672155782]

From Faisalabad

[pwuser155672155782]

So it wont fit technically or your arguments are just because of fitting mehran tyres on a kei car.

[pwuser155672155782]

Is there much of a difference between 185/65/15 and 165/70/14 regarding fuel average?

[pwuser155672155782]

Yes sir i daily drive 20 km. 10 km to office and back. But that 10 km get covered in 40-45 mins due to congestion.

[pwuser155672155782]

So what do you recommend ?
Would there be any benefit switching from 185/65/15 to 165/70/14?
Is it worth changing the rim and tyre due to cost?
If the difference is 1.5-2 km/L then shoudl I change?

[devils_smile]

It will fit. But the handling and ride characteristics will change for the worse. Stick to the factory spec tire/wheel size. There's a reason why it was chosen for this specific car

I'm running 185/65R15 6jj wheels on my 07 1kr vitz and clocking close to 250k. My cars averaging more than what you are experiencing so it might not just be the tires in your case

Steel wheels are cheap so that won't break the bank too much. Why not just wait and change your tires when the time comes for your current tires to be changed anyways

[pwuser155672155782]

The time to change Tyres has come so that is why I am asking for suggestions. So what do you recommend? I just change the tires with existing specs 185/65/15? Currently i have Alloy wheels. Uploading...

[pwuser155672155782]

[devils_smile]

These generic alloy wheels weigh a ton btw. If you want to stick to 15" wheels, look for some light weight 15" wheels
Else just get the 14" steelies with the factory size tire. You might not like the look of it but if you are looking for that 1.5-2 km/l increase, that's a good place to start

[pwuser155672155782]

Thankyou. Any idea how much would 4 steel rims cost? And what about buying from bilal ganj market lahore? I heard they are cheap

[shaamael]

There won't be a big difference in fuel consumption by reducing tyre size , before changing tyre profile give a last try by keeping 32psi in all tyres . Which engine oil grade being used ? Genuine or better quality air filter . If your car is running smooth without any issues ? Did CVT fluid change after 40k km ? Pour fuel system cleaner. Above all vitz 2011 won't give you more than 13 with AC in busy city traffic come what may .

[pwuser155672155782]

Never tried 32psi. Will give it a try. I use zic x-5 20/50, cvt fluid was changed, yes i use genuine air filter. Can you suggest any experienced fuel system cleaner?

[devils_smile]

Sheesh, 20/50. How much is your car driven? And signs of oil leaks? I use 0w20 in my vitz. The highest I would suggest 5w30. 20w50 is not an ideal oil grade for a 1kr unless you have serious engine issues

If you have a healthy engine with no oil leaks and no oil reduction, I'd suggest switch to 5w30. Observe your oil level. If everything is fine, you can switch to 0w20. Watch how your engine will thank you

[pwuser155672155782]

Bro my previous engine had 120k km on it. Then it got heated and jammed. I replaced head assembly like 3 months ago and bought it from bilal ganj. The mechanic told me that the engine is good but use 20/50 otherwise it will smoke and reduce oil level.

[devils_smile]

Like I said, I'm using 0w20 on my vitz even at 250k. Yes it does reduce less than a quarter on the dipstick at 8k change intervals but that's normal. I can always switch to 5w30 if I want.

It's better to try the new oil yourself and observe how your engine behaves. Switch to 5w30 and change it at 5k. Keep checking your oil levels even though I'm sure it won't be a problem. Your engine is probably chocking on that 20 50 oil