You will be able to detect hydrocarbons in the exhaust as the engine requires 4 stroke crankcase oil. Tiny amounts will be traceable as it lubes the engine. BUT this is NOT the source of the energy.

HHO recombination undergoes transformations due to valance electron binding regardless of the chemical reactions taking place it IS for all intents an Electron mitigating process and ambient energy is added to the recomposition back to water. This aspect is almost ALWAYS left out of Faraday equations where typical net energy gain for HHO often has a COP>3! While pulsed resonance electrolysis will increase the nett energy gain further still its NOT required to do so to realize OU. In fact conventional electrolysis can and does already yield excess energy with ICE and actually causes the ICE to run much colder than with gasoline mix or pure browns gas. To copy what i wrote elsewhere about this..

This is why in the looper for argument set some numbers and say they need 1kw
to break the water to HHO. This yields potential energy of of least 3kw upon
recombination. 1kW will be used to run the engine although a lot will go as heat
and can be recovered.

2kw will used to run generator which is also only 75% efficient but it will generate 1500 watts nett and recover the 1kw required to run the cell. Some 500 watts OU are left in the
system. Its enough to run a 500 watt flood lamp. Despite ALL the losses there is
enough OU to make it work.

This is why even when using tiny amounts in a car engine it has a great effect
on the fuel economy. Its not just about making a clean burn it adds energy at
the point of recombination to water far beyond that of conventional electrolysis
took to break it apart. If you add typical 3kw of real RE energy to a car engine
AND increase performance through a better burn of carbon products raising
efficiency from 23% to 29% it could easy result in an extra 5kw - 10kw of extra
power on the wheels which is about 10% of typical 100Kw car. Its enough to turn
on a tiny HHO cell and feel the extra KICK on the engine or increase mileage by
30-50% at steady 50-60MPH To fully realize these gains requires the map chip or oxygen sensors "lifting" to prevent excess fuel usage.

Youtube probably has some hundreds if not thousands of testimonies to this fact. After all anyone with some sense can see something special is happening far beyond the 500 watts of DC going into the cells. With fuel cost rising again at alarming rates semi truck drives with HHO twin stacks are getting from 6 - 8 mpg increased to 10 - 14 MPG. This represents a fuel saving of some $25,000 per year.

    Last measurements of the anton cells said around 90 liters of HHO per minute. Don't ask about the voltage and amps, they were huge.