Originally Posted by ThundercatRob
Not all cars have springs, some have air bags, some also have a self levelling function
Like I said, you're confusing springs, levelling and damping.
A 'spring' doesn't have to be made of steel coils: those are just one type of 'spring'...a spring can be an oil 'spring' - like in a hydraulic Citroen, a rubber 'spring' as in early non-BMW Mini's, or an air 'spring' such as in LR's, Jaguar's, MB's and trucks.
In all air sprung cars, the air provides the springing and directly replaces the steel coil springs of other cars. The air also - but separately - provides a hydraulic mechanism for the levelling function you talk of. This allows the level of a vehicle to be controlled - via an ECU - whether cornering, or under sharp braking or when heavily loaded. This keeps the contact patch of the tyre consistent with the road regardless of speed, braking or load. This managing of the tyre contact patch, through the air springing and levelling medium, is, in fact, an aid to reduced tyre wear not a mechanism that accelerates it.
If you're comparing, say, Disco 3/4 with a Defender for tyre wear, then factors like vehicle weight, vehicle performance potential, vehicle usage profile - whether it's the type of vehicle likely to be driven quicker or slower - tyre aspect ratio, tyre rubber mix, tyre design brief etc etc would be more significant than whether it was on air springs or not