I've been trying to determine if this might be considered not admisable (for repeating content?):

.php?state=Fl&statename=Florida // where engines pick up on

Of course many of the states don't have 1st/2nd character abbreviated equivalents:

.php?state=PA&statename=Pennsylvania

Also the same question for html tiles -- whether to include both.

Then there's the question of whether most searchers key-in abreviated names or full text verions. An example would also contain a similiar # of characters as 'Mechanic Jobs'. Many of the sites listing these titles do title with the full name preceeded like: " Florida Mechanic Jobs"

But are they trying to capitalize on proximity within their own folder structure - - with other related site topics?

Always strive to have the minimum number of parameters in a dynamic URL.

Never have more than 3 parameters in a dynamic URL.

Why repeat data? How would your site react to a request for php?state=PA&statename=Florida for example?

Use the state abbreviation OR the state name, not both.