Originally Posted by Bah Humbug

Aero, as any tri geek could tell you, is just about everything at those speeds. A nice, low, sleek TLX is going to cheat the air, and in fact part of the reason a lot of cars have broadly similar shapes these days is they're all designed in the wind tunnel (tempered by crash ratings), which doesn't exactly reward differentiation. It's why an Accord doesn't do much worse than a Civic on the highway, despite being bigger, heavier, and more powerful.