San Marcos Average Gas Price
| Regular | Mid-Grade | Premium | Diesel | E85 | |
|---|---|---|---|---|---|
| Week Ago Avg. | $2.79 | $3.19 | $3.62 | $3.28 | $2.62 |
| Month Ago Avg. | $2.76 | $3.18 | $3.59 | $3.27 | $2.62 |
Highest Recorded Average Gas Price In San Marcos Year to Date
| Price | Date | |
|---|---|---|
| Diesel | $3.34 | 03/03/25 |
| Regular | $2.86 | 04/10/25 |
Top 10 Gas Stations & Cheap Fuel Prices in San Marcos
Murphy Express in San Marcos (1201 SH-80)
1201 SH-80, San Marcos, Texas,
$2.92
Sep 05, 2025
0¢ Cashback
Exxon in San Marcos (1701 Old RM-12)
1701 Old RM-12, San Marcos, Texas,
$2.94
Sep 05, 2025
0¢ Cashback
Valero in San Marcos (420 Sarah St)
420 Sarah St, San Marcos, Texas,
$2.99
Sep 05, 2025
0¢ Cashback
Shell in San Marcos (2745 Hunter Rd)
2745 Hunter Rd, San Marcos, Texas,
$2.99
Sep 05, 2025
3¢ Cashback
Sunoco in San Marcos (3936 IH-35 S)
3936 IH-35 S, San Marcos, Texas,
$2.99
Sep 05, 2025
0¢ Cashback
Texaco in San Marcos (15610 Texas Hwy 123)
15610 Texas Hwy 123, San Marcos, Texas,
$3.00
Sep 05, 2025
0¢ Cashback
H-E-B in San Marcos (641 E Hopkins St)
641 E Hopkins St, San Marcos, Texas,
$3.05
Sep 05, 2025
0¢ Cashback
Chevron in San Marcos (115 Wonderworld Dr)
115 Wonderworld Dr, San Marcos, Texas,
$3.09
Sep 05, 2025
0¢ Cashback
Valero in San Marcos (204 Moore St)
204 Moore St, San Marcos, Texas,
$3.09
Sep 05, 2025
0¢ Cashback
Shell in San Marcos (934 N Interstate 35)
934 IH-35 N, San Marcos, Texas,
$3.11
Sep 05, 2025
3¢ Cashback
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Gas Data Methodology
The fuel prices published in this guide are based on the results of research completed by Way.com’s data team. Using a mix of external and internal data, we analyzed millions of prices across U.S. ZIP codes and globally.