Maine diesel prices today
Maine diesel prices todayDiesel averages $6.47 a gallon in Maine on 2 October 2026 — the 17th most expensive of 51 states, and down $0.04 on the week.
Maine against the other states
$0.11 a gallon above the unweighted mean of AAA's 51 state averages ($6.36). The cheapest diesel is in Texas at $5.79, the dearest in California at $8.38.
Regular gas in Maine is $4.40, so diesel costs $2.07 more per gallon — and more than premium at $5.43.
Tax on a gallon of diesel
$0.24 federal + $0.31 Maine · 28th highest of 51. The rest — about $5.92 — is the fuel itself, refining, distribution and the retailer’s margin.
Rates as of 1 January 2026. Local taxes, where they apply, are not included.
Diesel prices by city in Maine
AAA's diesel averages for 3 Maine metro areas, cheapest first — $0.07 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| Portland | $6.47 | −$0.00 |
| Bangor | $6.50 | +$0.03 |
| Lewiston & Auburn | $6.53 | +$0.06 |
Show the data as a table
What a diesel fill-up costs in Maine
- Diesel car or SUV — 18 gal$116.48
- Heavy-duty pickup — 34 gal$220.01
- Box truck — 60 gal$388.26
- Semi truck, two tanks — 250 gal$1,617.75
Diesel in neighbouring states
More for Maine
Frequently asked questions
How much is diesel in Maine today?
$6.47 a gallon, AAA's Maine average for 2 October 2026 — the 17th most expensive of 51 states. Regular gasoline is $4.40, so diesel costs $2.07 more per gallon.
Are diesel prices going up in Maine?
Diesel is down $0.04 (0.6%) on a week ago, and up $2.60 on a year ago, when it was $3.87, on AAA's own earlier averages.
Where is diesel cheapest in Maine?
Of the 3 metro areas AAA reports in Maine, Portland has the cheapest diesel at $6.47 a gallon and Lewiston & Auburn the dearest at $6.53. Individual stations vary around these averages.
How much is the diesel tax in Maine?
$0.55 a gallon: $0.24 federal plus $0.31 in Maine state taxes and fees, the 28th highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — New Hampshire ($6.39, $0.09 less). On a 100-gallon fill that is up to $8.60; whether it is worth the drive depends on how far the border is.