On the highway, at speed, the internal combustion engine is very efficient. Where the internal combustion engine bogs down is in stop and go traffic. There the electric engine is much more efficient. There are costs associated with a hybrid system not full appreciated by the public yet. The biggest is probably the limited lifetime of the batteries. Added complexity is another factor.
While the hybrid is a step in the right direction, in the end we still run out of oil. We need to start the search for something better than oil now, and big-time.
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