Searched around, im sure this has been discussed but can't find where. I was reading the manual front to back on the refurb 8500 and was wondering the best mode to set it on. I have heard not to set it on auto, which may or may not be correct. I assume highway is the most sensitive setting, but it does not say in the manual. And city mode has City, CityLox, and CityNoX, with decreasing sensitivities to x band. Would it just be better to set to highway, with x band manually turned off? Also, does having the scanning dots affect performance at all? (delay response time?) or is it just preference?