The Real Cost
Week of September 21, 2026 · Seattle, WA
2026 Mazda MX-5
11.9 gal tank · 29 MPG · manufacturer spec
$58–$68
typical fill → full tank · 11.9 galAt $5.69/gal, this tank gets you about 345 miles.
Source: EIA · Updated September 21, 2026
12-week state trend
+$0.62 over 12 wk
Local context
Seattle runs at $5.69/gal this week — about 27.1% above the U.S. average of $4.48. At this price the 2026 Mazda MX-5's 29 MPG returns roughly 5.1 miles per dollar (34.5 gallons per 1,000 miles).
At a typical 12,000 miles a year — the U.S. driving average — a Seattle driver spends about $2,355 on gas in this car (use the calculator for your own mileage). For the same car, $2,484 in California (priciest reporting state at $6.00/gal) vs. $1,626 in Texas ($3.93/gal). $858 swing.
By the numbers
Fill cost
$58–$68
typical → full · 345 mi/tank
Per gallon
$5.69
EIA weekly — Seattle
Monthly · 12k mi/yr
$196.28
34.5 gal
Annual · 12k mi/yr
$2355
414 gal
The math
Why it costs what it costs.
- Fill cost = 11.9 gal × $5.69/gal = $67.73
- Miles per tank = 11.9 × 29 = 345
- Annual @ 12,000 mi (typical) = 12,000 ÷ 29 × $5.69 = $2355
Want to customize miles per year or override the pump price you saw? Use the full calculator.