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You're number bending. You cannot move continuously change a few percentage points at each step. You can create whatever outcome you want by doing this.

In reality, the most efficient numbers are 41.5 kWh/kg with modern technology: https://www.pv-magazine.com/2023/08/14/hysata-testing-hydrog...

The Mirai gets 74 miles per kg of hydrogen according to the EPA. That's ~560 Wh/mi.

And no, a "modern EV" does not get 250 Wh/mi unless your talking about a smaller car than a Mirai. A good point of comparison might be the BMW i5 which gets ~320 Wh/mi. This is also from the outlet, and does not include upstream energy losses.

What people realize from honest analysis is that FCEVs and BEVs are around 1.5-1.75x of each other. But then people have realized that upstream losses, especially the need for energy storage for renewable energy, greatly undercuts this argument. For season energy storage, the mechanism is literally just burning/reacting hydrogen for electricity production.

So in reality the gap in efficiency is small, and as we switch to greener energy sources this gap shrinks.