the fuel efficiency is based on actual tests and experience na rin driving it. depende lang talaga yan sa paa natin at sa dinadaanan na rin.
regarding the USB... maaring subjective na rin sya - may point ka rin sa 32GB - that it is too much. but take into consideration the mechanisms and the whole process in utilizing those two media. i still think USB is more efficient and less expensive - kung nakabili ka ng sasakyan, what is 500-600 pesos for a 4GB USB drive? you only need ONE.
CDs, on the other hand use CD burners which costs more. not all computer systems have CD burners, like netbooks for example. you need CD burners to burn songs (and replace them if they fail which they do). you need to wait and waste precious time while the files are burnt. you will need to buy (or store) CDs every now and then. it's more complicated to burn CDs than transfer files into USB - ask someone who is not computer literate and i bet he will choose USB. these have been my annoyances in cars which only accepts CDs and doesn't even have the option for AUX port.
you don't need to organize playlists in USBs. you just have to sort it out into folders, like how you sort CDs. Think of folders as one physical CD. Sorting is done in the PC-side, NEVER in the car. organizing playlists is (the overrated) APPLE's thing, not USB (AUX, not USB). you can try it by thinking your CD is a 700MB USB drive - it's the same thing - controlling MP3s in the car is THE SAME WAY in both USB and CD (i use both USB and CD simultaneously for my MP3 - which is even more efficient). you can have a folder for alternative, a folder for techno house, etc. no need to eject then play. just press "next folder" button and play. you don't even have to move your arm when you change folders (especially with cars like Tucson GLS - nasa manibela na ung controls). this is where true multitasking comes into play.
