It happened for a bit last year too. I made weekly trips to the gas station to keep my heat going. Right now I see heating oil between $5 and $5.25 or so, and diesel around $5.75.

One is profits. Oil companies take a percentage of the cost in profit. 15% of $2.50 is $0.37, but 15% of $5 is $0.75. Yet we have to buy the same number of gallons to heat our homes. You'd think heating oil and diesel would come from the same places though.

Supply chain lag? I'd think most local oil companies are dealing with a lot more volume than your local gas station.