Gas prices in San Marcos, TX today
Updated Jun 14, 2026, 8:50 AM
Price by chain — today
Chain prices are estimates. We start from the Texas state average ($3.62/gal regular today) and apply typical per-chain offsets. Live per-station pricing coming soon.
cheapest
Murphy USA
$3.50
— no change
Buc-ee's
$3.54
— no change
HEB Gas
$3.57
— no change
Valero
$3.60
— no change
Exxon
$3.67
— no change
Conoco
$3.68
— no change
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Stations sorted by price
Gas prices in San Marcos, Hays County are updated hourly.
San Marcos is a city of 67,553 residents in Central Texas.
The cheapest regular unleaded today is $3.504/gal at Murphy USA — filling a 15-gallon tank costs $52.56.
Compared to the Texas state average of $3.624/gal, San Marcos drivers pay close to the statewide average.
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gas price
Price per gallon
Murphy USA · Regular
$2.79
Passengers
1
2
3
4
5
6
Distance
239 mi
Houston → Dallas
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Nearby cities
Fuel prices & local data — San Marcos, TX ⛽
8:50 AM CT
Hays CountyAustin–SA CorridorI-35 corridor67,553 residents
San Marcos hosts Texas State University (38,000 students) and two massive outlet malls — Premium and Tanger — that draw millions of shoppers from Austin, San Antonio, and Mexico.
68K
population
1.8
vehicles / household
18%
truck ownership
~$252
est. monthly fuel
What is the cheapest gas station in San Marcos, TX right now?
Murphy USA is currently the cheapest at $3.50/gal for regular unleaded. Prices last updated Jun 14, 2026, 8:50 AM.
Source: AAA Texas, updated Jun 14, 2026, 8:50 AM CT
How much does a full tank cost in San Marcos, TX?
At current prices, filling a 15-gallon tank costs $52.56 at Murphy USA. A 20-gallon tank costs $70.08.
Source: AAA Texas, updated Jun 14, 2026, 8:50 AM CT
Do Texas State University events affect gas prices in San Marcos, TX?
Home football weekends, graduations, and major campus events push local traffic and fuel demand above normal levels. San Marcos hosts Texas State University (38,000 students) and two massive outlet malls — Premium and Tanger — that draw millions of shoppers from Austin, San Antonio, and Mexico.
Source: AAA Texas, updated Jun 14, 2026, 8:50 AM CT