Hi, Mark. I can't speak to the steep gov't discounts on some vehicles and not others, but I can tell you that Richland County (SC) tends to purchase its vehicles from a limited number of manufacturers. I think this may have as much to do with limiting the diverse numbers of replacement parts they need to keep on hand for repairs as the upfront costs. (I also know SC has a State contract for vehicles, and cities/counties can purchase vehicles based on State contract prices.) I hope this helps at least a little.