Here is a coldfusion page I have created to keep track of my mileage. You can also download the page and an access database. You will have to change the datasourcename (line 1) to your data source name and you will have to change the purchase date on line 88 from 01/01/2000 to your purchase date.
ColdFusion custom tags are ColdFusion templates just like any other CFML file but are designed to be reused. Coders can save much time by packaging code that is used frequently or can easily add functionality by using free or inexpensive custom tags. There are two general categories of custom tags, one uses only ColdFusion's CFML code. The other packages C++, Java, or other languages into a custom tag that is used by ColdFusion. We'll cover only CFML based tags in this article. For our discussion we will be using CF_States from www.AspiringGeek.com.