ULSD futures fell just 1.52 cents per gallon on the day the Trump administration announced its Russian diesel purchase — a barely measurable move that captures how little the market expects the deal to change supply and demand fundamentals.

The weekly Department of Energy/Energy Information Administration retail diesel benchmark, the number most U.S. fuel surcharges key off, will be published Wednesday after a one-day delay from the Columbus Day holiday. It was last posted October 8 at $6.199/gallon, effective October 5, and the AAA daily average has been pointing the same direction: a 17-day unbroken slide took the national average from $6.5276/gallon on September 22 to $6.2785/gallon by Friday, a drop of roughly 25 cents.

Against that backdrop, the futures market has stayed volatile. ULSD settled October 6 at $4.5694/gallon, rose above $4.88 within two days, then settled Monday at $4.7232. By 10:45 a.m. EDT Tuesday it traded at $4.8185, up 9.53 cents or 2.02% — after touching an intraday low of $4.6431, a swing of about 17 cents. That volatility has been a market feature since the U.S. and Israel began military action against Iran at the start of March.

Why isn't the Russian deal moving prices?

The math explains the shrug. Under the deal, Russia is to immediately supply more than 300,000 metric tons of diesel to the world market. Using the S&P Global Energy conversion of 7.45 barrels per metric ton, that works out to about 2.235 million barrels. A further 500,000 tonnes would follow in November and 1 million tonnes soon after.

Compare that with consumption. U.S. demand for all non-jet distillates runs about 3.65 million barrels per day, according to the most recent EIA report, and OECD diesel consumption is estimated at roughly 13 million b/d.

Masha Kotkin, a fellow at the Center for Strategic and International Studies, told S&P Global Energy: "The amount of diesel Russia can provide would be a drop in the bucket compared to global demand. If you are asking about US diesel prices, I don't think it's going to make a difference."

Some members of Congress have gone further, criticizing the transaction as illegal. The parallel move to permit red-dye diesel over the road, meanwhile, has hit a regulatory maze and is largely being dismissed as well.

What is actually driving the volatility?

Much of the recent price churn traces to conflicting reports on how much oil is passing through the Strait of Hormuz. Without one definitive number for the market to agree on, uncertainty feeds price swings.

Even when flows are high, the mechanics behind them are expensive. Long-time analyst Paul Sankey told CNBC that barrels are not moving through the free flow of tankers that existed before the war.

"It's supplied at enormous military cost," Sankey said. "That's how you're getting the ships through, also with the shuttle tinkering. That's another level of cost." He estimated those costs at about $35 per barrel.

The deeper problem, analysts note, is that consumers buy refined products, not crude. Ellen Wald of Transversal Consulting told CNBC that markets have absorbed shocks through workarounds including strategic stock drawdowns, but that resilience has limits.

"We have seen some incredible resilience in the market," Wald said. "But at a certain point, things are going to start to give, and we're seeing that as prices are creeping higher and higher. Any attempts to bring them down that aren't actual new sources of supply don't really last."

What happens next?

The IEA's March collective stock releases continue, and executive director Fatih Birol on Saturday urged members to accelerate remaining volumes, prioritizing diesel. "Some members have already released greater volumes than they initially pledged in March," he said in a statement. For shippers and carriers, Wednesday's EIA benchmark will show whether the retail decline that ran through late September continues — but with refining capacity, not crude supply, as the binding constraint, analysts point to continued upward pressure on diesel costs into November.