The Real Cost
Week of September 21, 2026 · Portland, OR
2024 BMW X3
17.7 gal tank · 17 MPG · manufacturer spec
$77–$90
typical fill → full tank · 17.7 galAt $5.11/gal, this tank gets you about 301 miles.
Source: EIA · Updated September 21, 2026
12-week state trend · padd proxy
+$0.77 over 12 wk
Local context
Portland runs at $5.11/gal this week — about 14.0% above the U.S. average of $4.48. At this price the 2024 BMW X3's 17 MPG returns roughly 3.3 miles per dollar (58.8 gallons per 1,000 miles).
At a typical 12,000 miles a year — the U.S. driving average — a Portland driver spends about $3,604 on gas in this car (use the calculator for your own mileage). For the same car, $4,237 in California (priciest reporting state at $6.00/gal) vs. $2,773 in Texas ($3.93/gal). $1,464 swing.
By the numbers
Fill cost
$77–$90
typical → full · 301 mi/tank
Per gallon
$5.11
EIA West Coast excl. California weekly
Monthly · 12k mi/yr
$300.35
58.8 gal
Annual · 12k mi/yr
$3604
706 gal
The math
Why it costs what it costs.
- Fill cost = 17.7 gal × $5.11/gal = $90.38
- Miles per tank = 17.7 × 17 = 301
- Annual @ 12,000 mi (typical) = 12,000 ÷ 17 × $5.11 = $3604
Want to customize miles per year or override the pump price you saw? Use the full calculator.