Connecticut diesel prices today
Connecticut diesel prices todayDiesel averages $6.48 a gallon in Connecticut on 2 October 2026 — the 16th most expensive of 51 states, and down $0.01 on the week.
Connecticut against the other states
$0.12 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 Connecticut is $4.46, so diesel costs $2.02 more per gallon — and more than premium at $5.49.
Tax on a gallon of diesel
$0.24 federal + $0.52 Connecticut · 8th highest of 51. The rest — about $5.71 — 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 Connecticut
AAA's diesel averages for 6 Connecticut metro areas, cheapest first — $0.15 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| New Haven & Meriden | $6.45 | −$0.03 |
| Windham | $6.45 | −$0.02 |
| Hartford | $6.47 | −$0.01 |
| New London & Norwich | $6.48 | +$0.00 |
| Bridgeport | $6.56 | +$0.08 |
| Lower Fairfield County | $6.60 | +$0.12 |
Show the data as a table
What a diesel fill-up costs in Connecticut
- Diesel car or SUV — 18 gal$116.60
- Heavy-duty pickup — 34 gal$220.25
- Box truck — 60 gal$388.68
- Semi truck, two tanks — 250 gal$1,619.50
Diesel in neighbouring states
More for Connecticut
Frequently asked questions
How much is diesel in Connecticut today?
$6.48 a gallon, AAA's Connecticut average for 2 October 2026 — the 16th most expensive of 51 states. Regular gasoline is $4.46, so diesel costs $2.02 more per gallon.
Are diesel prices going up in Connecticut?
Diesel is down $0.01 (0.1%) on a week ago, and up $2.70 on a year ago, when it was $3.78, on AAA's own earlier averages.
Where is diesel cheapest in Connecticut?
Of the 6 metro areas AAA reports in Connecticut, New Haven & Meriden has the cheapest diesel at $6.45 a gallon and Lower Fairfield County the dearest at $6.60. Individual stations vary around these averages.
How much is the diesel tax in Connecticut?
$0.76 a gallon: $0.24 federal plus $0.52 in Connecticut state taxes and fees, the 8th highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — Rhode Island ($6.31, $0.16 less), Massachusetts ($6.36, $0.12 less). On a 100-gallon fill that is up to $16.40; whether it is worth the drive depends on how far the border is.