Goody, it is possible to over engineer things. I sometimes have a hard time knowing when to stop "making it better."

What I posted is a very basic spreadsheet that I cobbled together late one night. As I stated above, I have an updated version available that does have units of measure listed. However, I do not have admin access to that link so I can't change it.

The spreadsheet won't win any Formula 1 races (especially with friction as 1) but it'll be more than enough for a car on the street.