Advertisments on flyers, newspapers, etc?
Selling point for b-to-b, direct sales?
Use it as a selling point for a fleet account?
You might just find an "environmentalist" and open their eyes to your service.

I realize this may be a stretch or may be insignificant...
I thought about this sales point perhaps being appropriate when approching a human resources person to "sell" repairs to their employees or company-owned employee vehicles.
And, in this regard, has anyone had success selling to a large company like this, either to their "fleet" of vehicles or to their employees. This has been discussed before, but I don't recall much feedback or results. I want to give this a try myself. It's near-zero cost advertising, if it can get results.