There was no mention of a V in the cts so no they're not really gas hogs anyway.
Here you go
http://www.autotrader.com/fyc/vdp.jsp?ct=u&car_id=248959304&dealer_id=95008&car_year=2003&model=CTS&num_records=25&systime=&make2=&highlightFirstMakeModel=&start_year=2001&keywordsfyc=&keywordsfyc=&keywordsrep=&keywordsrep=&engine=&certified=&body_code=0&fuel=&awsp=false&search_type=both&distance=50&marketZipError=false&search_lang=en&showZipError=n&make=CAD&keywords_display=&color=&page_location=findacar::ispsearchform&min_price=&drive=&default_sort=priceDESC&seller_type=b&max_mileage=&style_flag=1&sort_type=priceDESC&address=43015&advanced=&end_year=2009&doors=&transmission=&max_price=11000&cardist=31