Cars of yesteryear were much lighter thanks to the complete lack of concern for safety...
You can make a car weigh less than 3600 lbs without compromising safety. It takes smarter design and use of materials, but it can be done, and it is done. Just not by domestic car makers that are struggling to survive as it is, without spending more money in engineering to make decent cars.
The biggest problem is that the heavier cars get, the more dangerous they get to the cars they collide with. So car makers just pudge it up a little more to pad their safety ratings without having to put some actual creative thought into the design.
The biggest danger is the DIFFERENCE in weight. If all cars were lighter, they would all be just as safe. The problem arises when your 2500lb Mazda Miata gets creamed by a 3700 tank of Ford Mustang.
Besides the safety, we are talking about cars that are supposed to be FAST, right?
Emissions are another thing, just because a car gets great milage doesn't mean it is a clean running engine... my brother's 1500lb '67 VW gets 45mpg with a carburated engine that has absolutly no emission controls. My 5000lb 2002 F-150 only gets 20mpg and produces a fraction of a fraction of the polution the old VW does.
Ok, so you've shown that the government has tightened emissions regulations since 1967???
A modern car with modern emissions controls is going to have a direct relationship between fuel economy and emissions. You burn twice as much fuel, you've got twice as much crap coming out of the tailpipe. The difference between '67 and 2002 is that there were different proportions of different kinds of crap, some kinds being worse than others. Year for year its virtually the same mix, pound for pound.
People like different looks, personally I think the '10 Mustang is the best looking car in production right after the new Challenger.
I think the '10 Mustangs look great. The Challenger does too. The Camaro looked good as a concept but it's un-grown on me for the production design.
I actually hated the design of the 350Z. Funny thing is, the 370Z didn't change that much, but it changed in all the right places and now it's dead sexy. And it's got bad ass technology too. Double wishbone and 4 link fully independent suspension instead of the garbage mcpherson struts and solid axles (sorry guys, great for trucks, shitty for a "sports car") most of the domestics are using. You can't even buy a Z now without a limited slip diff. And the only engine offered has more power than the Mustang GT.
Never been a Nissan fan, I don't see that changing either. I fit in my brother's old bug better than the 350Z (I think it was the 350 anyway, it might have been the other one) they had at the car show. Whatever it was there was no way I could do a long distance drive in it and still walk afterwards... not a selling feature for me. The Mustang is much more comfortable to sit in. The Titan felt decent, I think better than the Tundra but it would be down on my wish list after to the F-150, Ram and GMC. That was just by looking at them and playing with them, they don't let you drive them, and that was all I played with an the Nissan booth.
There's no way around not fitting in the car, but I'm not suggesting that they stick a Mustang logo on a 370Z with an all aluminum 4.6L. The platform is stretchable, they use the same platform for the 4-seat GTR and G37, two door and four door - a car hardly considered small.
I'm suggesting a stretched Z platform with similar headroom and legroom as a current model Mustang - with "modern" (that's tongue in cheek as the technology has existed in production use for 50 years) independent suspension and an all aluminum V8, weighing 3400lbs or less and giving up no measure of collision safety. But Nissan will have to build and design it because if Ford did it they'd have to get $80k to cut a profit.
Ford cars have been ranked very competitivly with their Japanese compitition lately, I think they are back on the ball of how to make a car.
Ford has definitely improved, and until I drive a few of the '10 and later models I have to withhold judgement. But there's a reason there's only ever been one exception to my rule of only buying their trucks. Most of what they made between the early 70s and mid '00s was 99% trash, periodically punctuated by a few cool models here and there like the SHO. Budget corner cutting and skimping on quality engineering has tarnished their name in my eyes and it's not going to go away overnight.