Diesel prices, April 2026: regional breakdown

April 2026 is the most expensive diesel month most owner-ops have seen since 2022. EIA's national on-highway average pushed toward $5.80/gal through the month, and the Q2 2026 forecast in the April Short-Term Energy Outlook averages $5.61/gal. The good news: every dollar at the pump is recoverable if you're paying attention to PADD differentials, fleet-card networks, and IFTA mechanics. The bad news: most owner-ops aren't.

I run our fuel-network desk and I burn through PADD spreads on a daily basis. Here's the snapshot for April 2026, the math on where to fuel, and the rewards programs we actually recommend to our carriers.

What "diesel price" actually means

When EIA publishes the U.S. on-highway diesel number every Monday, that's a national retail average across all five PADDs. Brokers and shippers use that number to set fuel surcharge — most contracts use the EIA national retail as the trigger.

But you don't fuel at "national average." You fuel at one truck stop in one state. That's where PADD differentials matter.

April 2026 PADD spread (snapshot)

Ranges are April 2026 estimates against EIA's national $5.61 Q2 average and the published April retail trajectory. Pull EIA's weekly retail page on Monday morning to lock the exact number for the week you're hauling.

Why PADD 5 is so expensive

The West Coast premium is structural, not a market quirk:

1. CARB-spec diesel. California requires a lower-sulfur, lower-aromatic ULSD blend that costs more to refine. Many West Coast retail stations sell that spec across state lines for logistical reasons.
2. Cap-and-trade + LCFS. California's Low Carbon Fuel Standard adds a per-gallon compliance cost — it varies, but it's a real number every gallon sold in-state.
3. Refining concentration. PADD 5 has fewer refineries than PADD 3. There's no major pipeline from the Gulf — product moves by ship or rail. Any West Coast refinery turnaround spikes local prices.
4. State fuel tax. California's diesel excise + sales tax stack is among the highest in the country.

PADD 3, by contrast, is where roughly half of U.S. refining capacity sits. Cheapest district every week, almost every year.

Cash vs. fleet-card pricing

The single biggest savings most owner-ops are leaving on the table is the difference between the cash price at the pump and the network discount their fleet card delivers.

If you fuel 600 gallons/week at $0.50/gal off retail through a fleet card vs. cash, that's $300/wk — about $15,600/year. That's not a rounding error. That's a transmission rebuild.

The fleet cards we actually see carriers running

There's no single best card — the answer depends on which network has stations on your lanes. The five we see most often on our desk:

• TCS Fuel Card — strong owner-op coverage, no minimum, weekly rebate. Good fit for 1–3 truck operations.
• Pilot/Flying J Pro / Pro Plus — best in-network for the Pilot footprint; skip if your lanes don't hit Pilot.
• Love's Express — Love's-network discount; growing footprint, especially in PADD 3 and PADD 2.
• Comdata — broad multi-network acceptance; preferred for fleets running mixed networks.
• EFS / WEX — comparable to Comdata; depth in the Northeast.

The right pick is the network with the most stations on your actual weekly lanes, not the brand with the loudest pitch. Pull last month's mileage report, plot the stops, and overlay each card's network map. Pick the card whose network covers your stops.

Fueling math: skip the truck stop, or take the discount?

The classic debate: TA Express off-network at $5.45 retail vs. Pilot Pro on-network at $5.85 retail with a $0.55/gal card discount = $5.30 effective.

That's an easy call — Pilot Pro wins by $0.15/gal and you build volume rebate tier. The case for off-network fueling is when:

• The off-network station is on-route and saves you 10+ deadhead miles.
• Your card has zero in-network stations within 60 miles.
• You're hot-loading and can't lose 30 minutes to the nearest network station.

Otherwise, take the discount.

IFTA — where you buy ≠ where you pay tax

This is the part most owner-ops misread. Under the International Fuel Tax Agreement, your fuel tax is calculated on the miles you drive in each state, not the gallons you buy. Quarterly:

1. Sum total miles by state.
2. Sum total gallons purchased.
3. Compute MPG.
4. Allocate gallons-burned per state by miles.
5. Compute tax owed per state minus tax paid at the pump.

Net effect: buying in a low-tax state (Texas, Oklahoma) gets you a cheaper retail per-gallon, but if most of your miles run California, you still owe California's tax on those miles. The win is on the retail side, not the tax side. Most fleet cards auto-generate the IFTA report by jurisdiction — that alone is worth the card fee on the smaller carriers.

What we're telling our carriers in May 2026

• Lock a fleet card if you don't have one. The math on fuel surcharge season is unforgiving without a network discount.
• Plan PADD 5 fueling to top off before crossing into California whenever possible. Crossing the AZ/CA or NV/CA line on a half-tank is throwing money at the cap-and-trade fund.
• Pull EIA Monday and check the FSC peg in your contracts against current retail. If your peg is below $2.00, you have meaningful FSC margin right now.

If you want help running the lane-versus-network math for your truck, our desk does fuel routing for our carriers daily. Sign on takes about 12 minutes, or just call (800) 555-0199.