Fuel is once again moving from a budget line item to a management priority for light- and medium-duty fleets. As of May 3, 2026, AAA’s national average for regular gasoline was $4.446 per gallon, while diesel averaged $5.642 per gallon. That is a sharp move higher: AAA showed regular gasoline up from $4.099 one week earlier and from $3.171 a year earlier; diesel was up from $5.464 one week earlier and $3.554 a year earlier.

The U.S. Energy Information Administration’s weekly benchmark tells the same basic story, though with a slightly earlier snapshot. For the week of April 27, 2026, EIA reported U.S. regular gasoline at $4.123 per gallon, up 7.9 cents from the prior week and 99 cents from a year earlier. EIA’s on-highway diesel price was $5.351 per gallon, down 5.2 cents week over week but still $1.837 above last year.

For fleets, the regional spread matters as much as the national number. EIA’s April 27 data put West Coast regular gasoline at $5.412, versus $3.675 on the Gulf Coast. California diesel was $7.228, compared with $5.012 on the Gulf Coast. Fleets operating across regions should avoid using a single national fuel assumption for bids, surcharges, route profitability, or branch-level budgets.

Where prices may go this summer

The most practical summer outlook is: high, volatile, and vulnerable to further spikes—but with some chance of easing if crude markets calm down. EIA’s latest Short-Term Energy Outlook forecast retail gasoline prices to peak at a monthly average near $4.30 per gallon in April, with gasoline averaging more than $3.70 per gallon for 2026. EIA also expected diesel to peak at more than $5.80 per gallon in April and average $4.80 per gallon for the year.

That forecast implies some moderation after the spring price surge. However, the daily AAA average had already moved above the EIA monthly gasoline peak by May 3, showing how quickly markets can outrun forecasts when crude oil, inventories, refinery operations, or geopolitical risks shift. AAA noted on April 30 that the national gasoline average had jumped 27 cents in one week, citing oil prices above $100 per barrel and uncertainty around the Strait of Hormuz.

For light- and medium-duty fleet operators, the conclusion is not to bet the summer budget on relief. Gasoline demand often strengthens during summer travel season, diesel remains exposed to freight activity and global distillate supply, and regional refinery issues can create local price shocks. A reasonable operating assumption is that gasoline may hover in the low- to mid-$4 range nationally unless crude prices retreat, while diesel is likely to remain especially painful for box trucks, step vans, service bodies, and other medium-duty assets.

Five short-term moves to reduce fuel spend

1. Attack idling immediately. Idling is one of the fastest fuel leaks to fix because it requires little capital. DOE says idling can use one-quarter to one-half gallon per hour, depending on engine size and air-conditioning use. A summer anti-idling push should focus on job sites, delivery queues, lunch breaks, and pre-cooling habits.

2. Coach smoother driving. Speeding, rapid acceleration, and hard braking are expensive at today’s prices. DOE estimates aggressive driving can reduce fuel economy by 15% to 30% at highway speeds and 10% to 40% in stop-and-go traffic. Telematics scorecards, weekly driver feedback, and incentive programs can turn this from a safety lecture into measurable savings.

3. Rework routes and dispatch windows. Reducing miles is better than improving MPG after the fact. The Alternative Fuels Data Center recommends route optimization to cut miles driven, stops, traffic exposure, idling time, and even the number of vehicles needed on certain routes. For service fleets, that may mean tighter territory clustering; for delivery fleets, it may mean shifting dispatch times away from congestion.

4. Tighten tire and maintenance discipline. Tire pressure checks are unglamorous but valuable. FuelEconomy.gov says properly inflated tires can improve gas mileage by 0.6% on average, and up to 3% in some cases. It also notes that using the manufacturer-recommended motor oil can improve fuel economy by 1% to 2%.

5. Put fuel purchasing under tighter control. Review fuel card rules, exception reports, after-hours fueling, tank size versus gallons purchased, and out-of-network transactions. Require odometer entries, flag MPG outliers, and compare fuel purchased against telematics miles. Even when prices are out of your control, leakage, fraud, and poor fueling behavior are not.

The fleets that perform best this summer will not be the ones that guess fuel prices perfectly. They will be the ones that manage gallons as actively as they manage labor hours, parts, and vehicle uptime. At today’s prices, every avoided mile, idle hour, harsh acceleration event, and unnecessary gallon has a much larger payoff than it did a year ago.