A lot of the price rise is due to geopolitical concerns fuelling speculative interest.
Because of this, there is concern of a potential disruption in gasoline supplies due to this switch-over.
The pullback appears to be due to profit-taking, which is not surprising considering prices have really surged in the past few days. The decline will not be large because the Iranian issue is keeping a high floor under prices.
The downward close on Thursday was due to the warmer weather forecast ... and today the market is correcting (that) so it's gone back up a little.