Are you sure about your labor rates?

Labor prices differ even in the same area. I worked at 3 different shops in Northern VA and there was almost $20/hr between the highest and lowest. Even dealerships can vary region to region. A Chevy dealer in Washington DC may charge $65/hr while the Chevy dealer in Warrenton VA may only charge $55/hr. And while dealers may have a minimum and maximum set by their corporations independent shops can charge whatever they please. I know this isn't the answer your looking for but, that's just the way it is.

depends on overhead and the quality of people you have working for them Roy