Many people complain about emissions laws today.
This gas recovery is just another one.
I'm not here as some kind of tree hugging, law abiding Mr. Do gooder.
Heck, I'm building a Godzilla Smog Monster!
But I can tell you a story:
Back in 69" or 70', my family & I; Took a trip to L.A. from N. CA.
When we got over the top of the grapevine, (Hwy 5) the smog was so thick, we had to turn on the headlights along like everyone else just so we could see where we where going. It was so bad it was like driving inside of a sewage pipe.
So it's a pain in the Arse this vapor recovery system is. However I do think it does help. Especially down near SoCal.