Another question that might be related is "Have bumper heights increased since the 80's?" With the advent of SUV/truck popularity, you had a large population of vehicles introduced to the road with their bumpers at a much greater height than the average car bumper and which presented a great safety threat to them. So taller cars might be a way for car designers to design taller bumpers into a car that are a closer match with SUV/truck bumper height. One advantage of my boattail is that it puts my bumper (the tip of the boattail) at the same height as the bumper on my F-150, which is at typical SUV height and rides over the height of my OEM Civic bumpers, rendering them almost useless in a crash with a SUV or full size pickup.
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