I believe that through the developments currently seen in nanoelectronics, super conductivity, nano materials (including nano scale magnets) and other materials research, that most of our vehicles will be totally electric powered within 25 years off of extremely powerful and efficient batteries (for the very developed countries). And the recharge electricity won't necessarily be coming from hydrocarbon fuels. If you don't believe me, check out the Small Times web-site...become amazed at where this technolgoy is headed.