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The dealership has some products that are competitive in the national market and those more targeted keywords (not local) run me less than half the cost per click.
The short answer is that IP addresses are handy in some countries/circumstances but there are other ways which can be used (such as the obvious locality keywords entered into a search).
No system is perfect but if you are targeting the US rather than the UK you are already 1 step ahead (IP's in the UK are a mess)