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General => General Discussion => Topic started by: Mallory Black on January 12, 2014, 09:37:12 PM

Title: Low Rolling Resistance Tyres
Post by: Mallory Black on January 12, 2014, 09:37:12 PM

Been doing some calcs and looks like the LT all terrain tyres we have on our (petrol V6) 90 Prado might be knocking our fuel consumption around  little.
Has anyone done some comparable consumption tests between a lighter highway treaded non LT tyre and AT or MT tyres with an LT case?

there would be a difference but not sure how much of a difference

Title: Re: Low Rolling Resistance Tyres
Post by: Hutch on January 12, 2014, 09:45:01 PM

Every car will be different but somewhere around .5 to 1 lt per hundred.

Hutch- Prado 150 with some TJM Kit.

Title: Re: Low Rolling Resistance Tyres
Post by: Black Diamond on January 12, 2014, 09:51:04 PM

Up to 5% are claimed but with Highway tyres. Can't see there being a massive difference between A/T's or MT's with a similar pattern.

Title: Re: Low Rolling Resistance Tyres
Post by: Mallory Black on January 13, 2014, 07:14:44 AM

I think for me it's about 1.5l/100
will keep checking

Title: Re: Low Rolling Resistance Tyres
Post by: RebsWA on January 13, 2014, 08:10:47 AM

Is there really such a thing?
With fuel economy being such a big ticket item these days with new cars you would think there would be a lot more publicity about tyres if one was better than the another.
I think economy is all about the pressure you run in them.

Title: Re: Low Rolling Resistance Tyres
Post by: Landyline on January 13, 2014, 09:04:06 AM

I would assume it is related to both weight and rolling resistance.

It definitely affects the fuel use. It is just more obvious on a petrol 4wd due to the already high use compared to a hatchback where you often see this advertised on tyres.  Our Corolla had Michelin Eco (?) tyres on it.

Title: Re: Low Rolling Resistance Tyres
Post by: Nomad on January 13, 2014, 09:58:39 AM

I have noticed over a litre difference.
But work pays for fuel so I don't care.

That was from Grandcraps to BFG AT's.
 :cheers:

Title: Re: Low Rolling Resistance Tyres
Post by: Robin Miller on January 13, 2014, 10:03:26 AM

As bending in rubber on both sides of contact patch is where the energy is lost , then as Reb says air pressure is biggest factor and you have control over it.

Sure it won't be as smooth but if your tyre placard says 30 then 40psi will make a significant difference and lower fuel use.

For same reason as a thinner tyre of same style will have less rolling resistance than fatter  (assumes air pressure adjused on each for same tyre load rating)

Same applies to trailer tyres.

The lower rolling resistant tyres are designed to minimize energy loss in bending rubber, e.g. one factor is thinner is easier to bend.