I know this Gas break down thing is complex and can not answer your question but I do have a couple of observations from my Time in Georgia.
First: I blew an engine (Well it got road killed so insurance covered, NOT my fault)
I was down 3 years. Seafoamed the tank but got a visit from a Gent named Matthew. and Matthew was no Gentelman. (he was a Hurricane) I was 3 miles out of the Mandatory evac area so I was without power for a while.. Ran Mr. Onan's contribution to my comfort and thus had to replace most of the gas during the course of the visit. Also had a few other reasons to run the ONAN. No fuel issues with either the ONAN or the Main engine when it was repalced.
While there there was anothe rig that had been parked.. Well it was there in 2011 when I first visited and again in 2014 (had not moved) and still in 2016 possibly 17 (when I left) but before I left the Owner ask me to assist in moving it to storage.. We put in a new chassis battery (old one was beyond hope) (Same for house) Got the slides in (Took 3 people and the converter. one pushed buttons Two pushed slide) Got the jacks up (one did not want to so I put a jack under it and hit the release valve) and then we fired that sucker up.
Ran like the day it was new.
