The Real Cost
Week of September 21, 2026 · San Antonio, TX
2023 Mercedes-Benz GLC300
17.4 gal tank · 22 MPG
$58–$68
typical fill → full tank · 17.4 galAt $3.93/gal, this tank gets you about 383 miles.
Source: EIA · Updated September 21, 2026
12-week state trend
+$0.64 over 12 wk
Local context
San Antonio runs at $3.93/gal this week — about 12.3% below the U.S. average of $4.48. At this price the 2023 Mercedes-Benz GLC300's 22 MPG returns roughly 5.6 miles per dollar (45.5 gallons per 1,000 miles).
At a typical 12,000 miles a year — the U.S. driving average — a San Antonio driver spends about $2,143 on gas in this car (use the calculator for your own mileage). For the same car, $3,274 in California (priciest reporting state at $6.00/gal) vs. $2,143 in Texas ($3.93/gal). $1,131 swing.
By the numbers
Fill cost
$58–$68
typical → full · 383 mi/tank
Per gallon
$3.93
EIA TX state weekly
Monthly · 12k mi/yr
$178.59
45.5 gal
Annual · 12k mi/yr
$2143
545 gal
The math
Why it costs what it costs.
- Fill cost = 17.4 gal × $3.93/gal = $68.36
- Miles per tank = 17.4 × 22 = 383
- Annual @ 12,000 mi (typical) = 12,000 ÷ 22 × $3.93 = $2143
Want to customize miles per year or override the pump price you saw? Use the full calculator.