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Lowest, mean and highest price recorded in the selected period. The state survey is the weekly statewide average; dealer figures are the cheapest, mean and highest posted price across each day's snapshot.
| Source | Minimum | Average | Maximum | Readings |
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The solid line is the weekly statewide survey average (full-service dealers, October through March). The shaded band runs from the cheapest to the highest price posted by delivery dealers each day, with their mean as the dashed line.
The most recent entries from every source, newest first.
| Date | State | Source | Low | Average | High |
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U.S. EIA weekly heating oil prices: the statewide residential average for each state, surveyed weekly October to March.
Massachusetts DOER survey: weekly average plus the 10th and 90th percentile dealer price.
NewEnglandOil.com: posted dealer prices across every delivery zone in each state, checked each morning.
Each morning the update reads every dealer zone for both states, keeps prices posted in the last 14 days, counts each dealer once (its most recent price), and records the lowest, mean, median and highest.
Rhode Island stopped publishing survey highs and lows in 2019, so the dealer snapshot is the only daily low and high for RI.
EIA collects weekly only in the heating season and did not publish Rhode Island or Massachusetts prices for most of summer 2025 and April to September 2026. EIA posts new weeks on Wednesday afternoons; the daily update picks them up the next morning.