San Marcos Average Gas Price
| Regular | Mid-Grade | Premium | Diesel | E85 | |
|---|---|---|---|---|---|
| Month Ago Avg. | $5.3 | $5.35 | $5.53 | $5.9 | $3.39 |
Highest Recorded Average Gas Price In San Marcos Year to Date
| Price | Date | |
|---|---|---|
| Diesel | $5.9 | 06/17/26 |
| Regular | $5.3 | 09/08/26 |
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
Sep 22, 2026
0¢ Cashback
7-ELEVEN in San Marcos (578 E Mission Rd)
578 E Mission Rd, San Marcos, California,
$5.89
Sep 22, 2026
0¢ Cashback
Shell in San Marcos (679 W San Marcos Blvd)
679 W San Marcos Blvd, San Marcos, California,
$5.90
Sep 22, 2026
3¢ Cashback
Chevron in San Marcos (130 Knoll Rd)
130 Knoll Rd, San Marcos, California,
$5.99
Sep 22, 2026
0¢ Cashback
7-Eleven in San Marcos (696 W San Marcos Blvd)
696 W San Marcos Blvd, San Marcos, California,
$6.05
Sep 22, 2026
0¢ Cashback
Shell in San Marcos (102 E Carmel St)
102 E Carmel St, San Marcos, California,
$6.09
Sep 22, 2026
3¢ Cashback
Find Cheap Gas Prices By State
Click on the state to view the State details
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.