The Real Cost
Week of May 18, 2026 · Boston, MA
2026 Mazda 3 4-Door 2WD
13 gal tank · 30 MPG
$57.82 to fill the tank
At $4.45/gal, this tank gets you about 390 miles.
Source: EIA · Updated May 18, 2026
By the numbers
- Fill cost
- $57.82
- 390 miles per tank
- $/gallon
- $4.45
- EIA MA state weekly
- Monthly (12k mi/yr)
- $148.27
- 33.3 gallons
- Annual (12k mi/yr)
- $1779
- 400 gallons
The math
Why it costs what it costs.
- Fill cost = 13 gal × $4.45/gal = $57.82
- Miles per tank = 13 × 30 = 390
- Annual (12,000 mi) = 12,000 ÷ 30 × $4.45 = $1779
Want to customize miles per year or override the pump price you saw? Use the full calculator.