In terms of strength/weight ratio then carbon fiber is excellentHowever in terms of strength/cost then steels is better With strength/weight then you save money in the long run (less fuel usage) but with strength/cost ratio you save money immediately when the car is madeSo it's a complex tradeoff that has to do with your time-value of money.
There's different types of strengthLinear strength, the carbon fiber is stronger and more resilientIt's also much lighter, as much as 1/10th the weight of an aluminum body panel (which is lighter than steel)So, by using steel body panels, you would actually likely be ADDING weight to your carCarbon fiber parts, of course, usually cost 2-3 times as much as their aluminum counterpartsNeedless to say, consider the alternativeYou can get an aluminum fender, have it be lighter than the steel part, not quite as light as the carbon fiber, but for the price of 1 carbon fiber fender, you could have a both front fenders and the hood in aluminumAlso, for the 1/4 mile, every 100lbs will drop 1/10th of 1 second off your time, which can be lost by screwing up your launch, or in other words, yo won't notice itAs for fuel economy, you won't notice a difference of more than .1-.2mpgI know this first hand.
Because no matter how hard the helmet is it can not prevent brain damage from your brain slapping the inside of your skullIf the helmet was able to absorb the energy from an impact and prevent you brain from moving inside your skull it would have to be huge and everyone would look like bubble heads riding on bikesThe sides would have to be around 12 inches thick on each side and top to provide that much protection and would probably break your neck if you were in a wreckHope I have been helpful.
