Don't get pumped.
As of 2 September 2026, the cheapest unleaded petrol in St Marys, SA is 193.5c per litre at U-Go, St Marys. Prices range from 193.5c to 198.9c across 3 stations, averaging 197.1c per litre.
Compare fuel prices from 3+ stations in St Marys. Average: 197.1c/L
Last updated: 06:13 AM, 02 Sep 2026
Petrol prices in St Marys currently range from 193.5c to 198.9c per litre for unleaded fuel, with motorists paying an average of 197.1c/L. We're tracking live prices from 3 service stations, which means you could save up to $2.70 on a 50L tank simply by choosing the right station. View all South Australia prices for broader comparisons.
Compare all fuel types in St Marys: Unleaded (ULP) from 193.5c/L, Premium 95 from 207.5c/L, Premium 98 from 216.5c/L. Each fuel type page shows the cheapest stations in the area, helping you find the best deal whether you need regular unleaded, premium fuel, or diesel.
South Australian prices are typically lowest Monday to Wednesday. Avoid filling up on weekends when prices tend to be higher. Check our Best Time to Fill Up guide for detailed advice.
Prices for St Marys are sourced from SA Fuel Pricing and community-verified reports, updating continuously throughout the day. Compare prices by brand or view our full station directory for more options.
South Australia shows moderate price cycling with mid-week peaks.
Check individual station prices in St Marys
Based on historical price patterns in St Marys, Monday tends to offer the best prices. Start of the week often brings lower prices as stations compete for customers.
| Rank | Station | Brand | Suburb | Price | Updated |
|---|---|---|---|---|---|
| U-Go St Marys | U-Go | St Marys | 193.5c | Today, 6:13am | |
| Shell OTR St Marys | OTR | St Marys | 198.9c | Today, 6:13am | |
| OTR St Marys | OTR | St Marys | 198.9c | Today, 1:50am |
| Rank | Station | Brand | Suburb | Price | Updated |
|---|---|---|---|---|---|
| U-Go St Marys | U-Go | St Marys | 207.5c | Today, 6:13am | |
| OTR St Marys | OTR | St Marys | 216.4c | Today, 1:50am | |
| Shell OTR St Marys | OTR | St Marys | 216.4c | Today, 6:13am |
| Rank | Station | Brand | Suburb | Price | Updated |
|---|---|---|---|---|---|
| U-Go St Marys | U-Go | St Marys | 216.5c | Today, 6:13am | |
| OTR St Marys | OTR | St Marys | 225.9c | Today, 1:50am | |
| Shell OTR St Marys | OTR | St Marys | 225.9c | Today, 6:13am |
| Rank | Station | Brand | Suburb | Price | Updated |
|---|---|---|---|---|---|
| U-Go St Marys | U-Go | St Marys | 245.5c | Today, 6:13am | |
| OTR St Marys | OTR | St Marys | 249.9c | Yesterday, 1:50am | |
| Shell OTR St Marys | OTR | St Marys | 249.9c | Yesterday, 11:58am |
| Rank | Station | Brand | Suburb | Price | Updated |
|---|---|---|---|---|---|
| Shell OTR St Marys | OTR | St Marys | 99.9c | Today, 6:13am | |
| OTR St Marys | OTR | St Marys | 99.9c | Today, 1:50am |
Find the best value by suburb - average unleaded petrol prices:
| Suburb | Stations | Average Price | Cheapest Price |
|---|---|---|---|
| St Marys | 3 stations | 197.1c | 193.5c |
Save money at these stations with the lowest ULP prices. Prices shown for all available fuel types:
| Station | Address | Brand | ULP | E10 | Diesel | P95 | P98 | Updated |
|---|---|---|---|---|---|---|---|---|
| U-Go St Marys | 1129-1131 South Rd & Southern Av | U-Go | 193.5c | - | - | 207.5c | 216.5c | Today, 6:13am |
| OTR St Marys | 1181 South Rd | OTR | 198.9c | - | - | 216.4c | 225.9c | Today, 1:50am |
| Shell OTR St Marys | 1181 South Road | OTR | 198.9c | - | - | 216.4c | 225.9c | Today, 6:13am |
Avoid overpaying - these stations have the highest ULP prices:
| Station | Address | Brand | ULP | E10 | Diesel | P95 | P98 | Updated |
|---|---|---|---|---|---|---|---|---|
| OTR St Marys | 1181 South Rd | OTR | 198.9c | - | - | 216.4c | 225.9c | Today, 1:50am |
| Shell OTR St Marys | 1181 South Road | OTR | 198.9c | - | - | 216.4c | 225.9c | Today, 6:13am |
| U-Go St Marys | 1129-1131 South Rd & Southern Av | U-Go | 193.5c | - | - | 207.5c | 216.5c | Today, 6:13am |
Savings Tip: Price difference between cheapest (193.5c/L) and most expensive (198.9c/L): 5.4c per litre. On a 50L tank, choosing the cheapest station saves you $2.70!
Compare fuel prices in these nearby locations:
St Marys has 3 petrol stations. Right now, ULP (unleaded petrol) prices in St Marys range from 193.5c/L to 198.9c/L (a difference of 5.4c/L).
Real-time data updated continuously from official government sources and community reports. We track live prices from major fuel brands including Ampol, Shell, BP, 7-Eleven, Coles Express, and independent service stations. The current average price is 197.1c/L (last updated: 06:13 AM, 02 Sep 2026).
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