Some say that the 92-95 civics were the most aerodynamically efficient. From looking at them, I'd have to agree. But the crx has a slight weight advantage, and the del sol has that floppy targa top to make structural flex a little more of a pest, but there are tradeoff for all these factors. It just depends on what you want. You first have to ask yourself what do you want to get out of the car? Name off specifics of what you wan the car to do for you, then get into these studies you are looking into, and see what drops out as you narrow your selections down. As for your schooling, it sounds like you might have some fun times travelling in the future. There is money to be had in the engineering world, you just have to have an open mind about the first few years of employment. You might not, and probably will not get your dream job right away, but if you stick to it, you'll usually end up with something you like. I'm not going to turn down 45-50k a year starting salary, which is the going rate for fresh out of college aero grads. That's like 3-4 times as much as I am making now, and it only goes up from there.