Completely anecdotal, but I was able to get the Vantage out today with the new gas cap.My business partner had errands to run so we took the Vantage. The CEL was still on when we left. Varied city and highway with 5 stops and at least 20 min cool downs - maybe 25 miles. Restart and light is gone.

Next I will put the OEM cap back on and see if it is leaking. Really happy. I need to get it thru DEQ and I was not looking forward to the Seattle trip.

x-chr