The 2020 Buick Regal TourX is available as a 4-door, 5-seat wagon. Starting at $29,370, the 2020 Buick Regal TourX Base is powered by a 2.0LL , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway. The top of the line 2020BuickRegal TourXEssence , priced at $ 35,070 , is powered by a 2.0LL , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 29-mpg on the highway.