Two Sedans with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the starting price, horsepower, and fuel economy. First of all, there is a $5,590 difference in the base MSRP. The 2016 Toyota Avalon has a higher starting price than the 2015 Chevrolet Impala. And finally, the 2016 Avalon has a more powerful engine than the 2015 Impala, but it gets 1.7 more miles on a gallon of fuel. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.