Carlos Ghosn, the CEO of Nissan and Renault said it was far too early to invest in hybrid technology, because costs outweighed the benefits for both consumers and manufacturers. The fuel savings of a hybrid vehicle did not justify the fuel savings incurred.
In fact, on highways a hybrid car like the Toyota Prius might actually use more fuel than a normal car. This is because on highway speeds, the Toyota Prius runs on full gasoline as the ECU detects highway long journeys might drain the battery too fast as the time for journeys are usually long and there is very little opportunity for regenerative braking. Since the Toyota Prius gasoline engine is quite tiny relatively, it actually has to work harder and use more fuel compared to a conventional powered vehicle with a larger more potent engine.