The national average price of diesel fell 1.2 cents last week, bringing the total down to $1.734 per gallon, according to the Department of Energy. The price decrease coincides with last week’s OPEC pledge to raise its output ceiling, and Saudi Arabia’s additional assurance to up its capacity in a bid to bring down pump prices.

California diesel received the largest drop, shedding 6.5 cents per gallon. Despite this, California remains the most expensive region to buy diesel at $2.121 per gallon. New England was the only region that posted an increase, rising at a modest 0.1 cents to $1.816. The Lower Atlantic is the cheapest region to fill up at $1.649.