Reminds me of back-in-the-day, when "they" were selling those "things" that were placed between the intake manifold and the carburetor ....... yep, it claimed to increase gas mileage by 25%.......
Further back, if one drilled a hole in the intake manifold of a Model A Ford, one could achieve a 20% increase in gas mileage .....
Even further back, the bigger the buggy whip one had, the faster the horse would run......for a while ........
Personally, if I want to go faster (to an extent), I just mash down harder on the gas pedal .......
humfrz