Fuel costs do not move the same way in Houston as they do in Los Angeles or Chicago, and any fleet manager who budgets off a single national average is working with an incomplete picture. The Petroleum Administration for Defense Districts, or PADDs, split the country into five zones based on refining capacity and pipeline infrastructure, and those zones behave like separate markets with their own baselines, their own spikes, and their own recovery patterns. Understanding where your routes fall on that map is one of the simplest ways to sharpen a fuel budget.
Why PADD Boundaries Still Matter
The PADD system dates back to World War II rationing planning, but it never went away because the underlying logic never went away. Refineries, pipelines, and import terminals are fixed assets. Gulf Coast refineries feed much of the country through pipeline networks, while the West Coast operates almost as its own island, with limited pipeline connections to outside supply and a unique blend specification tied to California's environmental rules. That isolation shows up directly in prices at the pump and in wholesale racks.
For a fleet running regional routes, this means two trucks running similar mileage in different PADDs can post very different fuel line items on the same day, even before you account for state fuel taxes or local competition. Dispatchers and finance teams who ignore this end up either underbudgeting for coastal lanes or overpaying for fuel risk insurance they do not need on cheaper corridors.
The National Baseline: How Far Prices Have Already Moved
Nationally, diesel started the year averaging $3.52 a gallon, climbed to a peak of $5.59, a jump of 59 percent, and now sits at $5.33. Regular gasoline followed a similar arc: a January average of $2.70, a peak of $4.35, up 61 percent, and a current price of $4.11. Prices have pulled back from their highs, but they remain well above where budgets were set at the start of the year. Anyone who locked in fuel assumptions in Q1 is now working with numbers that no longer reflect reality on either fuel type.
That gap between original budget and current cost is the real problem for fleets. A 59 to 61 percent swing in diesel is not a rounding error on a P&L. For a fleet burning tens of thousands of gallons a month, that kind of move rewrites the fuel line from a manageable cost center into the single biggest source of budget uncertainty in the business.
Gulf Coast (PADD 3): The Refining Engine, With Its Own Ceiling
PADD 3, the Gulf Coast region running from Texas through Louisiana into Alabama, is home to the densest concentration of refining capacity in the country. That proximity to supply usually keeps prices here below the national average, and the current numbers back that up. Diesel in the Gulf Coast started January at $3.23, peaked at $5.20 (up 61 percent), and now stands at $4.42. Gasoline moved from $2.41 in January to a peak of $3.98, a 65 percent increase, before settling at $3.48.
Being close to refining capacity does not mean immunity from global oil swings. It just means the region tends to feel moves a bit less severely in dollar terms even when the percentage swings are comparable to, or in gasoline's case even sharper than, the national figures. Fleets based in Texas, Louisiana, or the broader Gulf corridor still need to plan for real volatility. They just start from a lower floor.
Texas: A Bellwether Inside PADD 3
Texas gasoline prices track closely with the broader Gulf Coast pattern but started from an even lower base: $2.37 in January, rising to a peak of $3.96, a 67 percent jump, before easing to $3.60 currently. For fleets headquartered in Texas or running Texas-heavy lanes, that 67 percent swing is a useful reminder that even the cheapest fuel markets in the country are not insulated from the same forces driving prices everywhere else. The percentage move here actually outpaced the national gasoline increase.
West Coast (PADD 5): The Structurally Expensive Zone
PADD 5 covers California, Oregon, Washington, and the noncontiguous states, and it has long carried the highest fuel prices in the country because of limited refining connectivity, higher state taxes, and specialized fuel blends. The numbers this year confirm that pattern held. Diesel opened January at $4.18, climbed to a peak of $6.72, up 61 percent, and now sits at $5.81. Gasoline moved from $3.39 in January to a peak of $5.25, a 55 percent rise, and now trades at $4.81.
What stands out is that even though the West Coast's percentage increases are roughly in line with, or slightly below, the national and Gulf Coast figures, the dollar impact is far larger because the starting base was already so high. A fleet running West Coast lanes is not just paying more per gallon, it is absorbing a bigger absolute cost increase for every percentage point of oil market movement. That makes budget planning for California-heavy operations a different exercise entirely than planning for Gulf Coast or Midwest routes.
California: The Extreme Case
California's numbers illustrate just how far this can go. Diesel started the year at $4.66, peaked at $7.42, a 59 percent increase, and now stands at $6.92. Gasoline moved from $4.01 in January to a peak of $5.97, up 49 percent, and now sits at $5.66. Notice that California's percentage increases were actually smaller than the national averages for both fuels. The state simply started, and stayed, at a much higher price level throughout. For fleets with any California exposure, fuel cost per mile in that state needs its own line item, not a blended average pulled from national figures.
What Is Driving the Volatility Right Now
The forces behind these swings are not purely domestic. Reports of no planned talks between Iran and the United States have pushed oil prices higher in recent sessions, with ripple effects showing up in Treasury yields and a firmer dollar, both signals that traders are pricing in sustained geopolitical risk rather than a quick resolution. Analysts covering the region have described the broader outlook as fragile, noting that a diplomatic understanding remains possible this quarter but is far from guaranteed.
On the supply side, refining margins have stayed strong enough that BP reported a sharp jump in quarterly profit, more than doubling year-over-year results on the back of higher oil and gas prices and a stronger refining environment. Strong refining margins are not inherently bad news for fuel buyers, they can support supply availability, but they also confirm that upstream producers and refiners are capturing real pricing power in the current environment. For fleets, that combination of geopolitical uncertainty and firm refining economics points toward continued price choppiness rather than a return to January-level stability anytime soon.
Turning Regional Data Into a Fleet Budget
None of this is actionable unless it changes how a fleet actually plans. A few practical steps:
- Map your routes to PADD regions and track price behavior separately for each, not blended into one number.
- Weight your budget assumptions toward the region where you burn the most gallons, not just the national average.
- Revisit fuel budgets at least quarterly given how fast the percentage swings shown above have unfolded this year.
- Flag high-cost zones like PADD 5 and California for separate cost-per-mile tracking so they do not distort your fleet-wide averages.
This is exactly the kind of regional volatility that makes fixed-price fuel supply agreements useful for fleets that need predictable costs. FuelAnchor locks in a maximum price per gallon for the fuel you actually buy, so a spike in the Gulf Coast or a surge on the West Coast does not blow up a budget that was set months earlier. It is not about betting on where oil prices go next, it is about knowing your ceiling regardless of which PADD your trucks are running through.
Pull your last three months of fuel receipts, sort them by PADD, and see how much of your total spend sits in the highest-cost region. That single exercise will tell you more about where your budget risk actually lives than any national average ever could.