Petrol did go up like 20 dollars a barrel, which translates into about 20 cents a liter, how ever petrol has been about 16cents a liter "over priced" for the last couple of weeks (hence the bigger fuel discount vouchers available, there's a bit more room in the margin for them), so that jump of 20 dollars will probably take up that 16 cents and only show up as a 5 cent per liter increase.
The whole thing about taking time for the gas to get to the stations at that price, is not how they really do it. For each liter you buy at $1.95, they have to replace at $2, they align the pump price to the whole sale market price, and then put it up or down a little every so often to make up any shortages or let out any build up (though this is more often done through vouchers these days).
They do try put it as low as they can, because in the long run, quite a lot of driving (in the general population rather than us, and excluding trades men ect) can be substituted with public transport.