The Real Cost
Week of May 18, 2026 · Seattle, WA
2026 Mazda 3 4-Door 2WD
13 gal tank · 30 MPG
$72.68 to fill the tank
At $5.59/gal, this tank gets you about 390 miles.
Source: EIA · Updated May 18, 2026
By the numbers
- Fill cost
- $72.68
- 390 miles per tank
- $/gallon
- $5.59
- EIA WA state weekly
- Monthly (12k mi/yr)
- $186.37
- 33.3 gallons
- Annual (12k mi/yr)
- $2236
- 400 gallons
The math
Why it costs what it costs.
- Fill cost = 13 gal × $5.59/gal = $72.68
- Miles per tank = 13 × 30 = 390
- Annual (12,000 mi) = 12,000 ÷ 30 × $5.59 = $2236
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