We only do PPC for the co-op. I want to invest into doing adwords express through GMB but already don't have the bandwidth to handle whats on my plate. SEO is time-consuming and with 7 websites to manage that's essentially where my time goes. Could our PPC be more effective? Maybe...but honestly, I don't totally know that to be true. We're in a small state(s). DDC provides us with a service I don't have time to manage alone, and the CTR is higher than national averages and the CPC lower. My rep is always available and they are great people who treat me well.
If you want stellar PPC and SEO management, you may be better off going with a non-auto industry-specific company? Then again...who knows.