The engine runs much smoother and quieter

I put nano energiser into my 1926 Austin 12/4, 6 months ago.As the odometer is not accurate, difficult to show any fuel saving. However, I have found, that the engine runs much smoother and quieter. 

I have since then put the nano energiser into 2 more of my vintage cars, with similar results, and have just purchased more to put into the rest of my vintage cars.