According to me, you should use a spell checker.  According to
www.edmunds.com the 2006 Grand Prix hold's around 17 US gallons, which is
around 64.34 Canadian liters.  Meaning, if you were to fill it up in Oshawa,
Ontario (gas is around $1.36 here), it would cost around $87.52 to fill the
completely empty tank, same as my 2001 Intrigue.  Damned fun, eh?

http://www.edmunds.com/used/2006/pontiac/grandprix/100543802/specs.html

By the way, that is the Edmunds.com page for your Grand Prix.  It has tons
of useful information, but don't pay too much attention to anything Edmunds
says about Domestic auto makers.  If you really want real-world experiences
with Grand Prix's, try www.clubgp.com

Good Luck!!