San Marcos Average Gas Price
| Regular | Mid-Grade | Premium | Diesel | E85 | |
|---|---|---|---|---|---|
| Week Ago Avg. | $2.77 | $3.15 | $3.6 | $3.24 | $2.66 |
| Month Ago Avg. | $2.78 | $3.15 | $3.61 | $3.24 | $2.66 |
Highest Recorded Average Gas Price In San Marcos Year to Date
| Price | Date | |
|---|---|---|
| Regular | $2.86 | 04/09/25 |
| Diesel | $3.34 | 02/20/25 |
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
Oct 23, 2025
0¢ Cashback
Exxon in San Marcos (2041 IH-35 N Ste 104)
2041 IH-35 N Ste 104, San Marcos, Texas,
$2.99
Oct 23, 2025
0¢ Cashback
Texaco in San Marcos (15610 Texas Hwy 123)
15610 Texas Hwy 123, San Marcos, Texas,
$3.00
Oct 23, 2025
0¢ Cashback
H-E-B in San Marcos (641 E Hopkins St)
641 E Hopkins St, San Marcos, Texas,
$3.07
Oct 23, 2025
0¢ Cashback
Shell in San Marcos (207 I 35 Frontage Rd)
207 N IH-35, San Marcos, Texas,
$3.14
Oct 23, 2025
3¢ Cashback
Valero in San Marcos (420 Sarah St)
420 Sarah St, San Marcos, Texas,
$3.19
Oct 23, 2025
0¢ Cashback
Sunoco in San Marcos (3936 IH-35 S)
3936 IH-35 S, San Marcos, Texas,
$3.19
Oct 23, 2025
0¢ Cashback
Shell in San Marcos (207 I 35 Frontage Rd)
207 North Interstate 35, San Marcos, Texas,
$3.20
Oct 23, 2025
3¢ Cashback
Shell in San Marcos (2438 S I-35 S Frontage Rd)
2438 S I-35 South Frontage Rd, San Marcos, Texas,
$3.25
Oct 23, 2025
3¢ Cashback
Chevron in San Marcos (115 Wonderworld Dr)
115 Wonderworld Dr, San Marcos, Texas,
$3.39
Oct 23, 2025
0¢ 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.