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Find Cheap Petrol in St Marys, South Australia

As of 19 July 2026, the cheapest unleaded petrol in St Marys, SA is 162.9c per litre at U-Go, St Marys. Prices range from 162.9c to 166.9c across 3 stations, averaging 165.6c per litre.

Compare fuel prices from 3+ stations in St Marys. Average: 165.6c/L

Last updated: 11:58 AM, 18 Jul 2026

Open Map View
165.6c
Average Price (ULP)
162.9c
Cheapest Price
3+
Petrol Stations
4.0c
Price Range

St Marys Fuel Prices Today

Petrol prices in St Marys currently range from 162.9c to 166.9c per litre for unleaded fuel, with motorists paying an average of 165.6c/L. We're tracking live prices from 3 service stations, which means you could save up to $2.00 on a 50L tank simply by choosing the right station. View all South Australia prices for broader comparisons.

Fuel Types Available

Compare all fuel types in St Marys: Unleaded (ULP) from 162.9c/L, Premium 95 from 178.9c/L, Premium 98 from 187.5c/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.

Best Time to Fill Up

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.

Data Sources

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.

Petrol Price Trends in St Marys

Premium 95
182.6c
+4.5c (+2.5%)
7-day change
177.4c 7-Day Trend 182.6c
Range: 5.1c/L
Best: Tuesday
Premium 98
191.8c
+4.7c (+2.5%)
7-day change
186.8c 7-Day Trend 191.8c
Range: 5.0c/L
Best: Tuesday
Unleaded
165.6c
+3.8c (+2.3%)
7-day change
161.1c 7-Day Trend 165.6c
Range: 4.5c/L
Best: Tuesday

30-Day Price History

Average (30d) 179.0c
Lowest 177.4c
Highest 182.6c
Volatility Low
Average (30d) 188.1c
Lowest 186.8c
Highest 191.8c
Volatility Low
Average (30d) 162.4c
Lowest 161.1c
Highest 165.6c
Volatility Low

Price Cycle in SA

South Australia shows moderate price cycling with mid-week peaks.

Mon
Best
Tue
Best
Wed
Avoid
Thu
Avoid
Fri
OK
Sat
OK
Sun
OK
Start-of-week refueling (Monday/Tuesday) offers the best value in South Australia.

PetrolSMART. Smart Fuel Insights

Prices on the Rise
Heads up - prices are trending up about 6.0c over the next week. Might be worth filling up sooner rather than later.
95% Forecast Accuracy
Our price predictions are highly accurate, verified across 3.6M forecasts using proper scoring methods.
Cheapest Day: Monday
Historically, Monday tends to have the best prices around here. Worth keeping in mind for your next fill.
Might Be Worth Waiting
Prices could drop soon based on current trends. If you're not running on empty, might pay to wait a day or two.
Prices Rising
Up 3.8c this week. Fill up now. View cheapest station. Also check Port Augusta and Mount Gambier.

PetrolSMART Price Intelligence

PetrolSMART Market Sentiment
75%
25%
Fill Now
Good Value
Fair
Wait
Check

75% of stations suggest waiting might save you money

Price Cycle Overview

Distribution of stations across cycle phases in St Marys

Dominant
Rising
18% conf
Low 0% (0)
Rising 100% (3)
High 0% (0)
Falling 0% (0)
Rising Phase Dominant
Prices climbing - fill up soon to save
7-Day Price Forecast
+6.0c
average expected change
0
forecasting
drop
0
stable
12
forecasting
rise
Prices Expected to Rise
Prices across St Marys are forecast to rise around 6.0c on average. Consider filling up soon if you're running low.
Best Day to Fill Up
Monday

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.

Cheapest Petrol Prices in St Marys Right Now

Unleaded Petrol

Rank Station Brand Suburb Price Updated
U-Go St Marys U-Go St Marys 162.9c Yesterday, 11:58am
Shell OTR St Marys OTR St Marys 166.9c Yesterday, 11:58am
OTR St Marys OTR St Marys 166.9c Yesterday, 1:50am

Premium Unleaded 95

Rank Station Brand Suburb Price Updated
U-Go St Marys U-Go St Marys 178.9c Yesterday, 11:58am
OTR St Marys OTR St Marys 184.4c Yesterday, 1:50am
Shell OTR St Marys OTR St Marys 184.4c Yesterday, 11:58am

Premium Unleaded 98

Rank Station Brand Suburb Price Updated
U-Go St Marys U-Go St Marys 187.5c Yesterday, 11:58am
OTR St Marys OTR St Marys 193.9c Yesterday, 1:50am
Shell OTR St Marys OTR St Marys 193.9c Yesterday, 11:58am

Premium Diesel

Rank Station Brand Suburb Price Updated
U-Go St Marys U-Go St Marys 204.5c 17 Jul, 9:07pm
U-Go St Marys U-Go St Marys 204.5c Yesterday, 11:58am
OTR St Marys OTR St Marys 204.9c Yesterday, 1:50am
4 Shell OTR St Marys OTR St Marys 204.9c Yesterday, 11:58am

● Cheapest Suburbs for Petrol in St Marys

Find the best value by suburb - average unleaded petrol prices:

Suburb Stations Average Price Cheapest Price
St Marys 3 stations 165.6c 162.9c

✓ Cheapest Petrol Stations in St Marys

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 162.9c - - 178.9c 187.5c Yesterday, 11:58am
OTR St Marys 1181 South Rd OTR 166.9c - - 184.4c 193.9c Yesterday, 1:50am
Shell OTR St Marys 1181 South Road OTR 166.9c - - 184.4c 193.9c Yesterday, 11:58am

⚠ Most Expensive Petrol Stations in St Marys

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 166.9c - - 184.4c 193.9c Yesterday, 1:50am
Shell OTR St Marys 1181 South Road OTR 166.9c - - 184.4c 193.9c Yesterday, 11:58am
U-Go St Marys 1129-1131 South Rd & Southern Av U-Go 162.9c - - 178.9c 187.5c Yesterday, 11:58am

Savings Tip: Price difference between cheapest (162.9c/L) and most expensive (166.9c/L): 4.0c per litre. On a 50L tank, choosing the cheapest station saves you $2.00!

▸ Nearby Areas in SA

Compare fuel prices in these nearby locations:

Port Augusta
13 stations
Mount Gambier
9 stations
Port Lincoln
9 stations
Ceduna
8 stations
Blair Athol
7 stations
Bordertown
7 stations
Kadina
7 stations
Murray Bridge
7 stations
Whyalla
7 stations
Pooraka
6 stations
Port Pirie
6 stations
Renmark
6 stations
Strathalbyn
6 stations
Victor Harbor
6 stations
Waikerie
6 stations
Clare
5 stations
Coober Pedy
5 stations
Hawker
5 stations
Kingston Se
5 stations
Lyndhurst
5 stations
▸ View Interactive Map & Live Prices for St Marys →

Other Suburbs in South Australia

Port Augusta Mount Gambier Port Lincoln Ceduna Blair Athol Bordertown Kadina Murray Bridge Whyalla Pooraka Port Pirie Renmark Strathalbyn Victor Harbor

About Petrol Prices in St Marys

St Marys has 3 petrol stations. Right now, ULP (unleaded petrol) prices in St Marys range from 162.9c/L to 166.9c/L (a difference of 4.0c/L).

Data sourced from official government sources and community price reports, updated throughout the day. 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 165.6c/L (last updated: 11:58 AM, 18 Jul 2026).

How to Save Money on Fuel in St Marys

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