The Real Cost
Week of November 2, 2026 · San Antonio, TX
2026 Mazda MX-5
2.0L I4 Premium RWD · 11.9 gal tank · 29 MPG · manufacturer spec
$36–$43
typical fill → full tank · 11.9 galAt $3.58/gal, this tank gets you about 345 miles.
Source: EIA · Updated November 2, 2026
12-week state trend
+$0.06 over 12 wk
Local context
San Antonio runs at $3.58/gal this week — about 13.8% below the U.S. average of $4.15. At this price the 2026 Mazda MX-5's 29 MPG returns roughly 8.1 miles per dollar (34.5 gallons per 1,000 miles).
At a typical 12,000 miles a year — the U.S. driving average — a San Antonio driver spends about $1,481 on gas in this car (use the calculator for your own mileage). For the same car, $2,378 in California (priciest reporting state at $5.75/gal) vs. $1,481 in Texas ($3.58/gal). $898 swing.
By the numbers
Fill cost
$36–$43
typical → full · 345 mi/tank
Per gallon
$3.58
EIA TX state weekly
Monthly · 12k mi/yr
$123.38
34.5 gal
Annual · 12k mi/yr
$1481
414 gal
The math
Why it costs what it costs.
- Fill cost = 11.9 gal × $3.58/gal = $42.58
- Miles per tank = 11.9 × 29 = 345
- Annual @ 12,000 mi (typical) = 12,000 ÷ 29 × $3.58 = $1481
Want to customize miles per year or override the pump price you saw? Use the full calculator.