I began the fuel code odyssey several weeks ago.
For those interested, my stash of PU was bottled from early Nov 2013 to March 2014. Based on bottling dates, none of my earlier than Nov21/2013 PU have codes. So far all jugs opened bottled on Jan 5 through March have codes.
So perhaps somewhere between Nov 21 and Jan 5 codes began to be installed on caps?
Before I knew this I sent in a scan of my walmart receipt, and received my first code within about 2 weeks. Within a matter of days I began building my PU stash and quickly sent in another 3 or 4 codes. I have received none of those codes yet, and instead of how fast the first one was returned, I am approaching the 4 week time frame.
Once you attach a card to your account, the time from entry of the code to getting the $1/gal is immediate. Used mine for the first time within hours after I activated the card and added my first code. Got the card from a Shell station instead of waiting for it in the mail.
I plan on taking the codes from two of the "me" opened jugs and entering them this weekend to see if they also flow right through to the rewards card.