1) You can blend hydrogen with natural gas. To go 100% H2, you may need new pipes, but this isn't an insurmountable problem. 2) These sensors aren't that big.

1) You can blend hydrogen with natural gas. To go 100% H2, you may need new pipes, but this isn't an insurmountable problem. 2) These sensors aren't that big. It'll probably be like fire alarms but for hydrogen if we go that route. 3) The gap is shrinking over time, as fuel cells and electrolyzers get better. Batteries are basically maxed out on efficient so they won't improve by much. Loosely spoken, the gap should shrink to about a 50% advantage for the EV in the long run. That means EVs may always make sense for short ranged trips, but for anything that needs big batteries the cost of the batteries probably will outweigh electricity savings. 4) If electrolyzers get really cheap this may not hold. I suspect that optimizing to 60-70% utilization is more than good enough. 5) Relative to the competition, it is tiny. We're subsidizing wind, photovoltaics, batteries, etc., to the tune of tens of billions, but for hydrogen it was in the hundreds of millions. Though this is starting to change as well speak as hydrogen is starting to get bigger subsidies.