Even with the $5,000 difference between the Prius and non-hybrid Toyotas, there was a time when Toyota lost money on the car. Even when the car entered the black, and even though they halved the cost of the hybrid system from one generation to the next, Toyota still didn't make the margins on it that they did with their go-to sedans. Yet with plans to start making batteries for the Hybrid Synergy Drive in the U.S., Toyota says it should be able to halve costs again, and bring the next-gen Prius profit to near parity with the Corolla.

Petroleum prices are making electric vehicles and engines which run on biofuels look more and more attractive with each passing day. That's why its likely to be a hot topic this election season as each presidential candidate sets out his own unique proposals to ease the country into a new era of lower fuel consumption. Biofuels may be the quickest path to lower petroleum usage, but it's electric vehicles which present the biggest step forward in clean auto technology looking forward.

In these days of nearly nonexistent profits for every one of Detroit's Big Three automakers, R&D funds must be allocated very carefully. In contrast, Japanese manufacturers such as Toyota and Honda have been earning profits on a yearly basis. Not long ago, a mild spat arose regarding whether or not the Japanese government helped fund the development of Toyota's Hybrid Synergy Drive.