It's not necessarily hard nor easy to capture surfers' interest in your blog. A first consideration is: Whose interest do I want to capture?
It may be obvious that you want to "engage" those folks who may be looking for your type(s) of products and services. Often, if you place yourself in their shoes, and provide answers to the questions that they would ask, you're on the right track. In that regard, providing a Frequently Asked Questions (FAQ) section on your website may suffice. Going into some detail in a blog, and obtaining comments or follow-on queries from folks, will help to generate interest in those areas.
Blogging about cars and driving won't help you to "engage" the public's interest or potentially sell any other types of products and/or services! So, set your focus, and maintain that focus in all of your blogs. 