San Marcos Average Gas Price
| Regular | Mid-Grade | Premium | Diesel | E85 | |
|---|---|---|---|---|---|
| Week Ago Avg. | $4.98 | $5.11 | $5.28 | $5.12 | $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 | $5.12 | 01/10/26 |
| Regular | $4.98 | 03/27/26 |
Top 10 Gas Stations & Cheap Fuel Prices in San Marcos
Shell in San Marcos (800 S Rancho Santa Fe Rd)
800 S Rancho Santa Fe Rd, San Marcos, California,
$4.99
Apr 02, 2026
3¢ Cashback
ARCO in San Marcos (1187 W San Marcos Blvd)
1187 W San Marcos Blvd, San Marcos, California,
$4.99
Apr 02, 2026
0¢ Cashback
Shell in San Marcos (679 W San Marcos Blvd)
679 W San Marcos Blvd, San Marcos, California,
$4.99
Apr 02, 2026
3¢ Cashback
Chevron in San Marcos (1710 San Elijo Rd)
1710 San Elijo Rd, San Marcos, California,
$5.09
Apr 02, 2026
0¢ Cashback
7-ELEVEN in San Marcos (578 E Mission Rd)
578 E Mission Rd, San Marcos, California,
$5.13
Apr 02, 2026
0¢ Cashback
7-Eleven in San Marcos (696 W San Marcos Blvd)
696 W San Marcos Blvd, San Marcos, California,
$5.19
Apr 02, 2026
0¢ Cashback
Chevron in San Marcos (130 Knoll Rd)
130 Knoll Rd, San Marcos, California,
$5.19
Apr 02, 2026
0¢ Cashback
Chevron in San Marcos (1200 W San Marcos Blvd)
1200 W San Marcos Blvd, San Marcos, California,
$5.19
Apr 02, 2026
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.