Slight correction, my 100 has had the excessive vapor pressure/fuel boiling since I bought it. I've done practically all of the 'fixes' with varying degrees of success. I replaced the vapor canister just prior to installing the LRA tank and I still experienced excessive vapor pressure/fuel boiling the next time I went to Colorado. Alcohol free fuel has still been the most reliable 'fix' for me.I got myself some DBA rotors and pads for rear - hoping to address that soon.
Another issue that noticed on our last trip is excessive pressure releasing from the gas cap every time I open it for filling. I know this is a fairly well discussed issue, but I don't know of one solution that might have worked for anyone.
My engine and trans temps are all fairly good with no spikes and the fuel filter is new in the last 10k miles.
@87warrior I remember you had a similar issue once you installed the LRA tank! Did replacing the vapor canister help?