The analogy to cars misses where they are in their life cycle. When cars were evolving at a faster pace, and gas was relatively cheaper, they did get something

The analogy to cars misses where they are in their life cycle. When cars were evolving at a faster pace, and gas was relatively cheaper, they did get something like 5-10% efficiency, particularly when you correct for the level of emissions produced. Gas car technology matured, gas got more expensive, and cars got more efficient. Moore's Law isn't going to go on forever. We are hitting limits in battery life. Software will tend to get more efficient over time.