Energy Companies

They have a set price they can sell their product for. They have to go through a long process to raise their prices. By keeping the volume of gas for sale down, they don't need to expand infrastructure which costs lots of money and would necessitate a price hike. source

Oil companies don't control how fuel efficient cars are, consumers do. Nobody wants a car that eliminates enough safety features and modern niceties to get 100 mpg. GM stopped producing the EV1 because they realized that producing a car for which no infrastructure existed and therefore practically no consumer wanted to buy was a bad idea. Most people would still rather have a thirsty SUV, conversion van, or sports car that gets 15-20 mpg than a stripped down subcompact death trap that gets 50-75 mpg and as long as demand continues for inefficient cars, car companies will continue to produce them. People need to stop blaming the government and corporate america for everything because the problems that they have are nobody's fault but their own. source

It will absolutely will come from private innovation. Government may provide funds but the innovation will come through private entities. source

I had it last year and was under contract for a year. It was cheaper than most if not all electric companies at the time. source

How about installing piezo-electric crystals in truck wheels? A 70 ton, 18-wheeler would generate nearly 8,000 pounds of pressure on each wheel. Make the truck a hybrid, and the wheels could charge the batteries as they turn. source