The Real Cost
Week of September 21, 2026 · San Francisco, CA
2023 Mazda CX-9
19 gal tank · 23 MPG
$98–$115
typical fill → full tank · 19 galAt $6.07/gal, this tank gets you about 437 miles.
Source: EIA · Updated September 21, 2026
12-week state trend
+$0.83 over 12 wk
Local context
San Francisco runs at $6.07/gal this week — about 35.6% above the U.S. average of $4.48. At this price the 2023 Mazda CX-9's 23 MPG returns roughly 3.8 miles per dollar (43.5 gallons per 1,000 miles).
At a typical 12,000 miles a year — the U.S. driving average — a San Francisco driver spends about $3,167 on gas in this car (use the calculator for your own mileage). For the same car, $3,132 in California (priciest reporting state at $6.00/gal) vs. $2,050 in Texas ($3.93/gal). $1,082 swing.
By the numbers
Fill cost
$98–$115
typical → full · 437 mi/tank
Per gallon
$6.07
EIA weekly — San Francisco
Monthly · 12k mi/yr
$263.96
43.5 gal
Annual · 12k mi/yr
$3167
522 gal
The math
Why it costs what it costs.
- Fill cost = 19 gal × $6.07/gal = $115.35
- Miles per tank = 19 × 23 = 437
- Annual @ 12,000 mi (typical) = 12,000 ÷ 23 × $6.07 = $3167
Want to customize miles per year or override the pump price you saw? Use the full calculator.