>nobody is getting accords for power/speed

True, but speed isn't the only reason to have more power. There is safety measure, but also luxuries. I like my divertissement screen, the GPS, the collision detection, the heating seat, etc. All of this mean more not only more weight to carry around, but also more electricity that come from the engine.

I also like to have a responsive car and a smooth acceleration, and for that you need more power. You don't really need to put the engine to the max to reach illegal speed on the road, but a more powerful engine change drastically how driving the car at low speed feel.

>I want that more efficient engine in lighter weight body to maximize efficiency

And there is other models that do just that. That said, those models are a lot less popular in North American compared to Europe so there isn't as much model available. Manufacturers sell what the market want.