Fuel Price Trends (–present)
Five years of diesel and gasoline spend history drawn from actual fleet transactions. See the full context behind today's elevated costs—and how the current surge compares to prior peaks.
Average week-over-week change in fuel spend
Track how diesel and gasoline spend is moving week to week—including the dollar and percentage change—so you can spot acceleration, moderation, or stabilization as it happens.
Week | Diesel | Diesel WoW | Diesel WoW % | Gasoline | Gas WoW | Gas WoW % |
|---|
Regional fuel trends
Select a state to view weekly fuel price trends over time.
Performance benchmarks ($ change)
Select a state to view how its fuel prices compare to the national average and 3-month baseline—week by week.
vs 3-month baseline
State-by-state details
Fuel prices by state for the current week, with comparisons to the national average and 3-month baseline.
State | Price | National Avg | vs National | vs National % | 3-Mo Avg | vs 3-Mo | vs 3-Mo % |
|---|
Weekly fuel market briefing
Written analysis of recent fuel price trends, published every week.
Diesel prices rose 3.82% week over week, extending a 59.99% increase since year start as weekly gains continue to moderate from their early-March peak.
Diesel: $5.23 (+3.82% WoW, +59.99% vs Dec 29)
Gasoline: $4.13 (+1.52% WoW, +39.99% vs Dec 29)
3-week diesel change (Mar 2 → Mar 23): +23.14%
Diesel–gas spread: $1.09 (vs $0.31 baseline)
WHAT CHANGED THIS WEEK
Diesel increased 3.82% WoW, down from +4.82% the prior week
Gasoline increased just 1.52% WoW, sharply moderating from +6.59% the prior week
50.1% of the total diesel increase since Dec 29 occurred in the last 3 weeks (since Mar 2)
Diesel WoW (+3.82%) again exceeded gasoline WoW (+1.52%), continuing to widen the spread
Interpretation:
The deceleration trend that began in W12 continued this week — diesel gains have dropped roughly 70% from their W10–W11 peak, and gasoline increases have nearly flattened. Prices are transitioning from active repricing to an elevated plateau.
WHERE PRESSURE IS HIGHEST
Highest diesel states: Connecticut ($6.65), Washington ($6.33), California ($6.14)
Lowest diesel states: Montana ($4.82), Oklahoma ($4.87), North Dakota ($4.88)
National spread: $1.83 between highest and lowest states
Nevada posted the largest single-week jump (+$0.91), while Connecticut (+$0.57) and North Dakota (+$0.35) also saw outsized increases. Only 5 states saw WoW decreases (Virginia, Vermont, Indiana), confirming upward pressure remains broadly distributed. Connecticut leads the nation in YoY increase at +86.0%.
WHAT THIS MEANS
The headline risk has shifted. Four weeks ago, the concern was the speed of the repricing. This week, the concern is where prices settle.
Diesel WoW gains have dropped from +14.8% (W10) to +3.8% (W13) — a clear deceleration — but on a base that is now 60% above Dec 29
Gasoline is flattening faster than diesel (+1.5% WoW vs +3.8%), which means the diesel–gasoline spread ($1.09, up from $0.31) is now the primary margin pressure point for diesel-heavy fleets
43 of 48 reporting states still posted WoW increases — the repricing is slowing but not reversing
If next week's diesel WoW drops below +2%, that would confirm a plateau; a reacceleration above +5% would signal a second wave
The strategic question is no longer whether prices are rising — it's whether $5.20+ diesel is the new normal or an overshoot that corrects.
METHODOLOGY Aggregated weekly average fuel prices paid by customers; baseline = week of Dec 29, 2025.
Diesel prices rose 4.82% week over week, extending a 49.31% increase since year start and following two weeks of rapid escalation.
Diesel: $5.03 (+4.82% WoW, +49.31% vs Dec 29)
Gasoline: $4.07 (+6.59% WoW, +28.18% vs Dec 29)
3-week diesel change (Feb 23 → Mar 16): +36.20%
Diesel–gas spread: $0.96 (vs $0.20 baseline)
WHAT CHANGED THIS WEEK
Diesel increased 4.82% WoW, down from +13.16% the prior week
Gasoline increased 6.59% WoW, also moderating from prior double-digit gains
80.5% of the total diesel increase since Dec 29 occurred after Feb 23
Gasoline WoW (+6.59%) exceeded diesel WoW (+4.82%) for the first time since the acceleration began
Interpretation:
Weekly increases have slowed significantly—diesel gains dropped by roughly two-thirds from peak—but prices remain elevated following a rapid repricing period.
WHERE PRESSURE IS HIGHEST
Highest diesel states: Washington ($6.37), Hawaii ($6.23), Connecticut ($6.22)
Lowest diesel states: North Dakota ($4.56), South Dakota ($4.75), Nebraska ($4.76)
National spread: $1.81 between highest and lowest states
Price pressure remains geographically concentrated, with coastal and Northeast states sustaining the highest absolute costs. The Northeast (RI, ME, CT) is now posting the steepest weekly gains, suggesting a lagged repricing wave moving east.
WHAT THIS MEANS
Fuel prices have moved through a three-phase pattern:
Stability (through mid-Feb): single-digit weekly changes, gradual drift upward
Acceleration (Mar 2 → Mar 9): sustained double-digit weekly increases
Moderation (Mar 16): mid-single-digit increases on a higher base
Prices are no longer just rising — they've reset higher:
Diesel is +49.31% vs baseline
The diesel–gasoline gap has widened from $0.20 to $0.96
Cost pressure remains highest for diesel-heavy operations and high-cost states
All 50 states have higher diesel prices than a year ago (+48.48% YoY nationally)
METHODOLOGY Aggregated weekly average fuel prices paid by customers; baseline = week of Dec 29, 2025.
Diesel prices surged 13.16% week over week — the second consecutive week of double-digit gains — pushing the cumulative increase since Dec 29 to 42.45%.
Diesel: $4.80 (+13.16% WoW, +42.45% vs Dec 29)
Gasoline: $3.82 (+10.76% WoW, +20.26% vs Dec 29)
3-week diesel change (Feb 16 → Mar 9): +33.68%
Diesel–gas spread: $0.98 (vs $0.20 baseline)
WHAT CHANGED THIS WEEK
Diesel increased 13.16% WoW, slightly down from +14.83% the prior week but still in double-digit territory
Gasoline increased 10.76% WoW, roughly in line with the prior week's +10.34%
77.3% of the total diesel increase since Dec 29 has occurred in just the last two weeks
All 50 states saw diesel prices rise — no state was spared
Interpretation:
This is now the second straight week of double-digit diesel gains. The acceleration that began in early March is sustaining, not fading. Prices have moved from gradual drift to a full repricing event.
WHERE PRESSURE IS HIGHEST
Highest diesel states: Washington ($5.93), California ($5.91), Hawaii ($5.82)
Lowest diesel states: North Dakota ($4.42), Montana ($4.45), Nebraska ($4.59)
National spread: $1.51 between highest and lowest states
28 states above national average, 22 below
Biggest WoW movers: Idaho (+$0.44), Utah (+$0.43), Vermont (+$0.40). No state saw a decline — the repricing is universal across all 50 states.
WHAT THIS MEANS
The fuel market is now clearly in an acceleration phase. Two back-to-back weeks of 13–15% diesel increases have reshaped the cost landscape:
Diesel has gained over 42% vs the Dec 29 baseline in just 10 weeks
The diesel–gas spread has widened from $0.20 to $0.98 — nearly 5× the baseline
The pace of increase has not yet moderated, suggesting the repricing may have further to run
With 100% of states seeing increases, there is no geographic safe harbor this week
Diesel prices exploded 14.83% week over week — the largest single-week increase in the dataset — catapulting the cumulative gain since Dec 29 to 25.88%.
Diesel: $4.24 (+14.83% WoW, +25.88% vs Dec 29)
Gasoline: $3.45 (+10.34% WoW, +8.58% vs Dec 29)
3-week diesel change (Feb 9 → Mar 2): +19.71%
Diesel–gas spread: $0.80 (vs $0.20 baseline)
WHAT CHANGED THIS WEEK
Diesel increased 14.83% WoW, a massive escalation from +2.88% the prior week
Gasoline increased 10.34% WoW, also jumping sharply from +2.46% the prior week
74.6% of the total diesel increase since Dec 29 occurred in this single week and the one prior
All 50 states saw diesel prices rise
Interpretation:
This week marks the inflection point. After two months of low-single-digit weekly changes, diesel prices suddenly jumped nearly 15% in a single week. Gasoline followed with a 10%+ move. Something fundamental shifted in the market during the last week of February — the gradual drift is over and a rapid repricing is underway.
WHERE PRESSURE IS HIGHEST
Highest diesel states: California ($5.76), Washington ($5.63), Hawaii ($5.57)
Lowest diesel states: Montana ($4.08), North Dakota ($4.19), Minnesota ($4.36)
National spread: $1.67 between highest and lowest states
25 states above national average, 25 below — an even split
Biggest WoW movers: North Carolina (+$0.74), South Carolina (+$0.67), Virginia (+$0.67). The Southeast posted the largest dollar increases this week, with the Carolinas and Virginia leading. Biggest declines: North Dakota (−$0.36), Oklahoma (−$0.34), Minnesota (−$0.31) — Plains states bucked the trend.
WHAT THIS MEANS
This is the week the market broke. The data tells a clear before-and-after story:
Before (Jan–late Feb): diesel WoW changes ranged from −0.4% to +3.2% — normal weekly noise
After (Mar 2): +14.83% in a single week, with gasoline following at +10.34%
The diesel–gas spread quadrupled from $0.20 to $0.80 in one week, signaling that diesel-specific supply factors are driving this move
The geographic pattern is unusual — the Southeast led increases while Plains states actually declined, suggesting regional supply disruptions rather than a uniform demand shock
METHODOLOGY Aggregated weekly average fuel prices paid by customers; baseline = week of Dec 29, 2025.
Methodology: The Samsara Fuel Spend Index is based on anonymized, aggregated fuel transaction data from Samsara customers across the United States. Prices reflect the average price per gallon paid by customers for diesel and gasoline, calculated on a weekly basis using transaction‑level data as recorded in customers’ fuel transaction records. National figures represent a weighted average across all included transactions. State‑level figures reflect average prices for transactions where the fueling location is within that state. Weekly periods are defined by the week start date and include all transactions recorded during that week. Transactions with missing or clearly erroneous price or volume information, and states with insufficient transaction volume in a given week, may be excluded from the analysis. Disclaimer: The Samsara Fuel Spend Index reflects fuel prices paid by Samsara customers and may not be representative of all U.S. fuel purchases or market participants. Prices may vary based on factors including fleet composition, geography, routing patterns, fuel purchasing programs, contractual agreements, and other conditions outside of Samsara’s control. This information and any related analysis are provided for informational purposes only and should not be interpreted as a forecast or guarantee of future fuel prices or market conditions. The Index does not constitute investment, trading, financial, tax, or legal advice.
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