Having a site with work hours, phone number, and current address helps in Google Maps. You can also add a "sign up for updates and coupons" thingy and at least some people will sign up. If it's cheap to setup, might as well do it.

In particular with car mechanic I would like to know the cost of basic services like tire rotation. I know it's $20-$30 at a major brandname, but I could use a local shop so I don't have to drive out of my way. Some car dealers service departments now have online services to schedule appointments and such, I think half of that can be repurposed for a small car mechanic shop as well.