Yes. Tires get hotter when speed is increased causing more wear. Example- Racing car tires wear out very quickly because of speed combined with high heat. Indy cars and cars used in Nascar may only get a few laps before needing changing.
Addition:
The effect isn't as drastic on passenger tires but speed does effect wear.
Only on a front wheel drive vehicle. On a rear wheel drive the rear tires wear faster. rotate your tires every 10,000 miles and they will wear evenly.
Because they are used for steering and get more wear.
So it can wear out the outer tread faster thus causing faster front tire wear which will help to sell more front tires.
Rear
You wear them out faster and they do not give adequate grip on rainy days.
When the tire tread wears down to the wear bars, the tires are ready for replacement.
Possibly, but it could be tire wear, as well. A new tire typically has 28/32nds tread depth.. this decreases as the tires wear down.
No, since they dont have the original tread, they tend to wear down quicker.
Front tyres wear faster on FWDs and with understeer, more worn tires will be more permeable to air. In fact unless you like doing heaps of fishys, doughys and burnouts, your tyres will wear faster than the front in any well balanced car.
Tires have molded indicators called "wear bars." If these are visible across the tread pattern, your tires need to be replaced.
Underinflated tires wear faster on the sides than the middle.
It is necessary to balance your tires when they are rotated because blancing results in equal air pressure on all 4 tires. Less air in one of the tires will result in faster wear, resulting in the need to rotate more often.