Rolling resistant tyres.

[neil]

Good read if your into saving fuel.

http://smh.drive.com.au/motor-news/treading-lightly-20100205-nhph.html

[team_v]

I may be showing my ignorance here, but doesn't rolling resistance = grip?

[GoLfMan]

rolling resistance is frictional losses created by the tyre on the ground. Lower the frictional losses, the less energy the engine requires to push the car along ie: less fuel.

something like that anyway!

[brad]

I may be showing my ignorance here, but doesn't rolling resistance = grip?

Yep.

There's an Autocar test out their that also tested rolling resistance. There was an almost perfect correlation between Best to Worst tyres & highest to lowest rolling resistance. I was quite keen on changing to low RR tyres until i read that.