Limited time fuel offer

Today I went to my local neighbourhood Shell Shell station close to my favourite liquor store, and was able to find a curious sign:


Now even though gas is $1.059/lire in Edmonton right now, that's not a half bad deal. The silver gas is easier on your engine (apparently), and it costs you absolutely no premium to use it (assumably, the bronze gasoline "would" be at the price they claim its at, though it is comparable to other gas prices at this time.

I wonder if this is at all related to this news story from February.