Hi

Sorry for repeating, but you gave the answer all by yourself: if you need to know how many people searched for "New car" in the U.S. , you can use both Adwords keyword tool and google trends to get this data. Here is an example for the car industry. Once you determine the keywords you need, you can benchmark and analyze data with many tools (eg. google trends and google adwords, or also semrush, searchmetrics, and moz tools), to get the trends and search volume for all those keywords, and get insights on the industry field youre working on.

Hope this helped