San Marcos Average Gas Price
| Regular | Mid-Grade | Premium | Diesel | E85 | |
|---|---|---|---|---|---|
| Week Ago Avg. | $5.3 | $5.35 | $5.53 | $5.9 | $3.39 |
| Month Ago Avg. | $4.98 | $5.11 | $5.28 | $5.12 | $3.39 |
Highest Recorded Average Gas Price In San Marcos Year to Date
| Price | Date | |
|---|---|---|
| Diesel | $5.9 | 06/15/26 |
| Regular | $5.3 | 06/15/26 |
Top 10 Gas Stations & Cheap Fuel Prices in San Marcos
Chevron in San Marcos (1710 San Elijo Rd)
1710 San Elijo Rd, San Marcos, California,
$5.79
Jul 07, 2026
0¢ Cashback
7-ELEVEN in San Marcos (578 E Mission Rd)
578 E Mission Rd, San Marcos, California,
$5.89
Jul 07, 2026
0¢ Cashback
Shell in San Marcos (679 W San Marcos Blvd)
679 W San Marcos Blvd, San Marcos, California,
$5.90
Jul 07, 2026
3¢ Cashback
Chevron in San Marcos (130 Knoll Rd)
130 Knoll Rd, San Marcos, California,
$5.99
Jul 07, 2026
0¢ Cashback
7-Eleven in San Marcos (696 W San Marcos Blvd)
696 W San Marcos Blvd, San Marcos, California,
$6.05
Jul 07, 2026
0¢ Cashback
Shell in San Marcos (102 E Carmel St)
102 E Carmel St, San Marcos, California,
$6.09
Jul 07, 2026
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.