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Toyota’s hidden engine has been unveiled—it burns hydrogen and only emits water, with up to 45% thermal efficiency—and passenger and van models are already ready

by Laura M.
August 14, 2025
in Mobility
Toyota's hidden engine has been unveiled—it burns hydrogen and only emits water, with up to 45% thermal efficiency—and passenger and van models are already ready

Toyota's hidden engine has been unveiled—it burns hydrogen and only emits water, with up to 45% thermal efficiency—and passenger and van models are already ready

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Toyota has just launched an engine that doesn’t pollute! When everyone seemed sure that the future of cars was all about plugs, Toyota comes out with this: a combustion engine that runs on hydrogen and emits only water vapor. Not a trace of CO₂, and with numbers that make many electric cars look bad, ouch. What if we rushed into demonizing traditional engines?!

The prototype offers up to 400 horsepower and 45% thermal efficiency, something that until now was only seen in the best diesel engines on the market. Toyota doesn’t just want to bring combustion back to life, it wants to do it cleanly. And yes, they’re pulling it off. What doesn’t Toyota manage to do?

Hydrogen engines

We’re talking about pure combustion engines, which instead of burning gasoline, burn hydrogen. That way you keep the traditional driving feel  but without polluting anything!

The result is an engine that runs like a sports car, has the soul of the old ones and doesn’t leave behind dangerous waste! An all-in-one that might appeal to those who still haven’t fallen for electric cars!

Power and efficiency you don’t see every day

The 45% thermal efficiency figure is serious. Very few diesel engines get there. And if you add 400 HP to that, you’ve got something that’s not just for compacts or sedans: it also works for big vehicles, even trucks!

It only emits water vapor, not a gram of CO₂

No smoke, no particles, no carbon dioxide. What comes out of the exhaust is just water vapor, nothing else! Toyota wants to seriously reduce its carbon footprint, but without giving up what many drivers still prefer: a traditional mechanical engine, the kind that roars!

Japan doesn’t want to surrender to electric cars

Of course, competitors don’t want to stay quiet either. Japan, for example, doesn’t want to fall behind in innovation, but it also doesn’t want to hand the whole future over to batteries. Toyota, which has been researching hydrogen for years, now wants to apply it to all kinds of vehicles, from passenger cars to trucks. And it looks like they’ve started doing it. That said, there are no official dates yet, just the news that they’re going to keep researching combustion, even if it’s green.

Goodbye to fully electric?

No, not at all. Electric cars are another very good driving option (even though they’re silent), and no one’s saying electric cars will disappear tomorrow, but if this technology catches on, it could take a good chunk of the market, especially for those who don’t want to wait forever to charge.

So what’s up with hydrogen?

Lots of advantages! You can refuel in minutes, it has more range, and it adapts better to certain needs where electric cars, for now, don’t quite cut it. It doesn’t release waste (just water), and it feels like you’re driving a traditional one.

But, hydrogen still raises questions about mobility (because it needs special refueling stations) and transport might be one of the big challenges of this new trend.

And it’s not just about hydrogen…

Even though Toyota is now going all in on hydrogen, there are more fuels on the list: methanol, ammonia, nitrogen and even compressed air. But for now, hydrogen seems to be in the lead, especially because of the infrastructure that’s already being developed.

What if it was never just about batteries?

This engine is a warning. Toyota wants to prove that combustion isn’t dead, it just needs a change of approach. And if it can be done without polluting, why not?

The question isn’t if the future will be electric or hydrogen, but if we’re ready to accept that maybe there’s more than one possible path!

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