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yes it does take more energy than is available simply within the exhaust gases. I'm not pretending to say its totally free. The ideas I've seen so far are two part. One part is an algae base that the bacteria eat along with CO2 to produce fuel. The advantage of the system is you get the added boost of the algae eating up CO2 during peak production hours.
Disadvantage is you have to feed the bacteria, but the algae can pretty effectively manage that without much attention.
The point still remains, if you can convert your exhaust gases into consumable fuel for low cost low maintenance you would be a fool not to. The system's beauty is its passivity. You pump exhaust across it and just make sure the algae gets sun and it takes care of everything else for you. drain the tanks filter them separate the aqueous layer off, refine slightly , done.
You went from producing electricity to producing electricity and a substantial chunk of petrol.
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