When crude oil prices go down, the oil companies say you don't see price reductions at the pump for around 8 weeks since that's roughly the length of time it takes the product to go through the supply chain.
When crude oil prices go up, the price at the pump goes up immediately - sometimes only a few days, but other times, just a few hours. Amazing supply chain, that.
Or - AS USUAL - we're being lied to.
Blatantly.