[alalbertson]

There is a massive amount of conservative estimates implemented in current EPA standards. Further, air emission standards are typically based off "potential to emit" to add.

A ~8% difference in efficiency is large, but even without the aforementioned "wiggle room" in standards, a 90% reduction still drastically reduced its footprint converting to CO2 vs methane.

[schiffern]

It's not just an ~8% difference in efficiency, it's a 350% difference in purported emissions. The actual emissions are 4.5x larger than claimed: 9% vs 2%.