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I've driven everything from a Cadillac hearse to a Geo Prism. Physics have stayed the same. Weight reduces MPG. Lighter wheels make for more MPG. I agree that a larger diameter anti-roll bar would improve cornering. Coast into a turn and gently accelerate out of it. Imagine a ballon under your foot. I went to the next size wider and lower profile tire on an aluminum rim for more control. The wheels from my old "88 Escort GT fit my '95 Geo Prism. Stiffer springs and shocks are not usually needed but look at upgrading suspension bushings. A good front air dam will reduce understeer as well as drag.
Weight is only one factor crash safety. More important are chassis geometry and material strength. That is why a carbon fiber monocoque F1 car can hit a barrier at 140 mph and the driver survive. Hitting the same barrier at 40 mph with a 1/2 ton pickup truck could be just as hazardous to your health.
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