The 2016 Buick Cascada is available as a 2-door, 4-seat convertible. Starting at $33,065, the 2016 Buick Cascada Base is powered by a 1.6L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway. The top of the line 2016BuickCascadaPremium , priced at $ 36,065 , is powered by a 1.6L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway.