I really like entry 16. The "P" could double as a gauge with a needle and it's a nice simple design, very modern. I'm not sure what would take it from good to great but I definitely like that one the best.
I don't like #20, the geometric shapes never did it for me.
I like 17 but ti doesn't say Pacific or auto auction to me. 15 is closer to that mark as the orange could be an island or a wave or something. 19 has the wave effect but it's a bt busy for my taste, too many concentric circles
57-59-60 I like the idea of the C as being wheels but the cars are too cartoonish for an industrial business. 52-56 are very feminine. Again, a little too feminine for an industrial business.