Discount Tire has a gimmic that's new to me... checking the age of the spare, and recommending that the customer buy a new one (due to OLD tires not being safe-ish)

 hell, spare tires don't need to be 5 star safety rated, they just need to get you to the nearest tire shop. 

But there's another interesting thing they do that is not new, it's a real old way to drive up business - free air and tire inspection. 

Because if someone needs air in their tires, they probably have a leak, and even if they don't, getting people to stop by so their tire tread can be checked for excessive wear? Well that's just going to get tires flying off the warehouse shelves! 

Anyway, those are pretty good ways to increase profits