The Mirai has a 1.6 kwh battery pack because the fuel cell cannot output the needed power for acceleration and to allow regenerative braking. It runs on the ele

The Mirai has a 1.6 kwh battery pack because the fuel cell cannot output the needed power for acceleration and to allow regenerative braking. It runs on the electric motor alone just like a Tesla. But yeah so add the buffer battery in your weight calculations needed for a fuel cell vehicle. Pretty minor difference in size, unclear how that translates into usable space: Mirai Length 4,890 mm Width 1,815 mm Height 1,535 mm Model 3 Length 4,694 mm Width 1,849 mm Height 1,443 mm Also note the Mirai has a single 113kw motor (even with buffer battery to help) while the long range single motor model 3 is 211kw and only weighs 1730kg, I actually posted the heaviest performance AWD model 3. The Tesla completely outperforms the Mirai in cost, weight, ease of charging and performance.