But wouldn't you have to say "The car that has the highest mileage is the least expensive one"? (not which, which needs a comma before it and is reserved for nonessential information?)

I'm  going to keep teaching that the indefinite antecedent (which, this, that clauses referring to entire sentences or clauses) is not a good construction (at the most correct level).    

>>> [log in to unmask] 09/28/04 08:06PM >>>
"Which" functions as both interrogative pronoun -- "Which is the least 
expensive car?" and as a relative pronoun: "The car which has the 
highest mileage is the least expensive one." It also takes an 
interrogative determiner function, as in "Which car is the least 
expensive one?" (it is modifying 'car', not replacing it).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Johanna Rubba   Associate Professor, Linguistics
English Department, California Polytechnic State University
One Grand Avenue  * San Luis Obispo, CA 93407
Tel. (805)-756-2184  *  Fax: (805)-756-6374 * Dept. Phone.  756-2596
* E-mail: [log in to unmask] *      Home page: 
http://www.cla.calpoly.edu/~jrubba 
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