Not much at all - this period shown is probably more fuel than usual. I average ~ 15K p.a. I only have a 45l tank + 7l emergency, so last night I used one of those 15c offers (7.5 x 47, rounded down) = 352 points + Myer One points + CC points.
I agree with you - I prefer points to discount as the fuel is already tax deductible to me. I changed ~ 12 months ago and haven't looked back. They still show as fuel discounts on the App, but convert due to my preference of "points". Most of the Caltex operators are a bit surprised but glad they don't have to do more keystrokes to take the discount off the bill.