I've found some salesman are just plain ignorant or haven't educated themselves about the various models they are trying to sell. A few times I've had to correct them as I had done more research than they had. I remember test driving a new Ram. This was about 2010 or so. As we rode around, he either miss stated the horsepower rating of the truck or just simply guessed. I recall telling him, that no, that's incorrect. Either way, he was not knowledgeable about the product.Sales people lie for no reason other than don't know any better.
For a while it seemed the turnover among salesman at the dealership was high as when I brought our vehicles in for service, there were two or three new salesmen working. Since 2006 we've made three purchases there - each one handled by a different salesman. The previous ones we dealt with were long gone. I doubt we'll be purchasing from there any time in the near future. We experienced better salesmanship at CarMax.