[698969]

It's fair game to compare if you include the conversion efficiency of the organisms that made the fossil fuels :P

We care about the efficiency of converting resources we have a limited amount of, sunlight is unlimited on humanity's scale, so is wind, but how much solar or wind power we can extract from them and transmit has constraints and that is the step where we should start caring about efficiency

[akoboldfrying]

This is indeed a good argument to burn our limited petrol supplies for heat (closer to 100% efficient) instead of using it in today's inefficient ICE cars.