[theazureguy]

yeah that's fair, without wholesale rack prices as a baseline you can't really isolate station behaviour from what's happening upstream.

[gruez]

>without wholesale rack prices as a baseline

The US government publishes data on this (eg. https://www.eia.gov/petroleum/gasdiesel/). The UK government might have something similar. Barring that, you can use Brent crude as a proxy.