Connecticut vs Massachusetts gas prices
Regular gas is $0.08 a gallon cheaper in Massachusetts — $1.20 on a 15-gallon fill-up. The two share a border, so that gap is worth knowing before you cross it.
Connecticut| Grade | CT | MA | Diff. | |
|---|---|---|---|---|
| Regular | $4.20 | $4.12 | $0.08MA | Massachusetts |
| Midgrade | $4.79 | $4.75 | $0.04MA | Massachusetts |
| Premium | $5.20 | $5.15 | $0.05MA | Massachusetts |
| Diesel | $5.55 | $5.48 | $0.07MA | Massachusetts |
Where the $0.08 gap actually comes from
None of it is tax. This is the case people assume never happens: Connecticut is dearer at the pump while taxing a gallon $0.02 less than Massachusetts. The whole gap is the cost of the fuel itself — refinery proximity, pipeline access and state blend rules — and the tax difference is quietly shrinking it.
Fuel, refining, distribution and marginFederal and state taxes Pre-tax figures are estimates — see the note below.
What the gap is worth
Based on today’s $0.08 per-gallon difference, which moves week to week. Use the fuel cost calculator for your own mileage and vehicle.
Prices by metro area
State averages hide a lot. These are the cheapest metros AAA reports on each side.
Other comparisons
Frequently asked questions
Is gas cheaper in Connecticut or Massachusetts?
Regular gas is cheaper in Massachusetts, at $4.12 a gallon against $4.20 in Connecticut — a gap of $0.08, or 1.9%. On a 15-gallon fill-up that is $1.20. Figures are AAA daily state averages for 2026-08-02.
Why is gas more expensive in Connecticut?
Not because of tax — Connecticut actually levies $0.02 a gallon less than Massachusetts. The whole $0.08 gap, and more, is the cost of the fuel itself: refinery proximity, pipeline access and state fuel-blend rules. Tax policy is narrowing this gap rather than causing it.
Is diesel cheaper in Connecticut or Massachusetts?
Diesel is cheaper in Massachusetts at $5.48 a gallon, against $5.55 in Connecticut — $0.07 a gallon apart.
Is it worth crossing from Connecticut into Massachusetts to fill up?
If you are already near the line, yes: a 15-gallon fill saves about $1.20. Driving out of your way for it rarely pays — at $4.20 a gallon and 25 mpg, a 4-mile round trip would eat the whole saving in fuel alone, before your time.