Well here’s another source where you can read about evaporative emissions if you think they don’t exist or are some Russian conspiracy theory:
https://www.automotive-iq.com/exhaust/articles/evaporative-emission-regulations-and-evap-systems
“There are several ways in which evaporative emissions can escape a vehicle, including permeation through the walls of a fuel tank and fuel hoses, losses through valves and fuel caps, as well as diurnal losses when the vehicle is at standstill caused by temperature changes.”
“Testing procedures and protocols vary significantly however, and limits on emissions vary throughout the world, as the map below shows. Euro 5/6 regulations continue the Euro 4 limits of 2 grams of evaporative emissions per day, but require a more demanding test fuel with 5% ethanol and imposing durability requirements.
Japanese emission standards for vehicles are jointly developed by two government ministries, the Ministry of the Environment (MOE) and the Ministry of Land, Infrastructure and Transport (MLIT). Evaporative emission limits in Japan are roughly in line with Euro 4 standards of 2 grams of emissions per day.
U.S. regulations (EPA stage II enhanced/CARB LEVII) limit evaporative emissions to 0.5 grams per day over a three day diurnal temperature profile.”
I’d say it’s pretty strange for all these countries to have limits on daily leakage from evaporating fuel if these modern emission systems are 100% effective at capturing these emissions.
According to your own information let’s say a given gasoline tank contains 15 gallons, that’s 57204 grams of fuel. 2 grams amounts to a rounding error. 1% as was being discussed in the thread would be 572 grams, or as posited in you first post to me of 40% would be 22881 grams. Of course a vehicles’ Evaporative Emissions System is not a perfect containment vessel on a molecular level, buts it’s hardly the losing proposition you contend, I know, I know, maths are hard.
Thermodynamic Modeling and Evaluation of Fuel Evaporation in Petrol Engine Tanks
And guess what...
...Additionally, the amount of fuel vapor was strongly dependent from the filling level in the tank. Upon increase of the filling level from 40 % to 90 % the fuel vapor evaporation reduced by about 33 %.
Meanwhile, guess what Deep States, plural, are making it harder and harder to do...
NONE of this is about saving the planet, is it.