The 2011 Lexus IS 250C is available as a 2-door, 4-seat convertible. Starting at $41,190, the 2011 Lexus IS 250C (M6) is powered by a 2.5L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway. The top of the line 2011LexusIS 250C(A6) , priced at $ 42,360 , is powered by a 2.5L , 6 - cylinder engine that returns an EPA estimated 21-mpg in the city and 30-mpg on the highway.