Here it's 12 c/liter or about 48 cents per gallon more for premium.  Regular is a t 98.9/L.  There is no difference between cash and credit or debit card.

Your brother in law is still right according to a Suncor fuel specialist I talked to a couple of months ago.  

Here, premium does not contain ethanol. 

Edmonton AB Canada where we have two active refineries with a third less than 100 miles south.

On 2012-02-05, at 3:11 PM, Automatic digest processor wrote:

> Date:    Sun, 5 Feb 2012 09:11:51 -0800
> From:    Mike Miller <mwmiller6@ATT.NET>
> Subject: Re: Gas Brand Preferences?
> 
> The cash-credit difference in CA is about 4-10 cents/gal.
> 
> The difference in price between grades is usually 10 cents/gal. My brother in
> law who worked for Shell for a bazillion years tells us that the difference in
> cost to make it is about 5 cents/gal, low to high. Mid grade is just a blend 3
> parts low to 2 parts high.
> 
> Just what I heard.
> 
> Mike