> energy per gram of fuel

That just not a metric that matters.

Fuel is north of 1c/kWh for nuclear reactors, +/- if you count various things as fuel costs, that’s inherently a big deal if you’re trying to compete with 2c/kWh solar.

> Fast reactors weren't pursued because of nuclear weapon proliferation risk

They also just have higher costs per kWh.

> That just not a metric that matters.

So you said that fuel costs dominate the cost of energy delivered, I'm saying that you can deliver the same energy while purchasing less fuel, but now you're saying that that's not a metric that matters for the cost of energy delivered. Err, wut?