What is the cheapest petrol price in St Marys today?

The cheapest unleaded petrol in St Marys is currently 171.10c per litre. Prices range from 171.10c to 177.90c across 1 stations we monitor in the area.

When is the best day to buy petrol in St Marys?

In SA, petrol prices typically follow a weekly cycle. The best time to fill up is usually early in the week (Monday to Wednesday) when prices are at their lowest. Avoid filling up on Thursday or Friday when prices tend to peak.

How often are fuel prices updated in St Marys?

Petrolmate updates St Marys fuel prices in real-time using official government APIs and community data. Prices are refreshed multiple times throughout the day to ensure accuracy.

Is E10 cheaper than regular unleaded in St Marys?

Yes, E10 is typically 3-5 cents per litre cheaper than regular unleaded (ULP) in St Marys. E10 contains 10% ethanol and is suitable for most vehicles made after 2005. Check your vehicle manual for compatibility.

Find Cheap Petrol in St Marys, South Australia

Compare fuel prices from 1+ stations in St Marys. Average: 174.5c/L

Last updated: 12:49 AM, 30 Jan 2026

Open Map View

174.5c

Average Price (ULP)

171.1c

Cheapest Price

Petrol Stations

6.8c

Price Range

St Marys Fuel Prices Today

Petrol prices in St Marys currently range from 171.1c to 177.9c per litre for unleaded fuel, with motorists paying an average of 174.5c/L. We're tracking live prices from 1 service stations, which means you could save up to $3.40 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 171.1c/L, Premium 95 from 151.9c/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.

PetrolSMART. Smart Fuel Insights

Prices Holding Steady

Prices are pretty stable at the moment. Fill up whenever suits you best.

77% Forecast Accuracy

Our price predictions are reliable, verified across 2.6M forecasts using proper scoring methods.

2 Price Drops Spotted

We've found 2 servos with recent price drops across 9 stations in this area. Check the list below for the cheapest.

Cheapest Day: Thursday

Historically, Thursday tends to have the best prices around here. Worth keeping in mind for your next fill.

Good Time to Fill Up

Based on current prices and trends, 12 of 9 local servos are showing good value right now.

PetrolSMART Price Intelligence

Price Drops
in last 24h

PetrolSMART Market Sentiment

32%

38%

30%

Fill Now

Good Value

Fair

Wait

Check

Most stations in St Marys are at fair prices

7-Day Price Forecast

-0.6c

average expected change

forecasting
drop

stable

forecasting
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Prices Expected to Hold Steady

Prices across St Marys are expected to remain relatively stable over the next week. Fill up when convenient.

Best Day to Fill Up

Thursday

Based on historical price patterns in St Marys, Thursday tends to offer the best prices. Some areas see prices start to rise on Thursday ahead of the weekend.

Cheapest Petrol Prices in St Marys Right Now

Unleaded Petrol

Rank	Station	Brand	Suburb	Price	Updated
	U-Go St Marys	Independent	St Marys	171.1c	Yesterday, 2:40pm
	U-Go St Marys	Independent	St Marys	177.9c	Today, 12:49am

Diesel

Rank	Station	Brand	Suburb	Price	Updated
	U-Go St Marys	Independent	St Marys	167.9c	Today, 12:49am

Premium Unleaded 95

Rank	Station	Brand	Suburb	Price	Updated
	U-Go St Marys	Independent	St Marys	151.9c	Today, 12:49am

● Cheapest Suburbs for Petrol in St Marys

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

Suburb	Stations	Average Price	Cheapest Price

✓ 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	Independent	177.9c	-	167.9c	151.9c	-	Today, 12:49am

⚠ 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
U-Go St Marys	1129-1131 South Rd & Southern Av	Independent	177.9c	-	167.9c	151.9c	-	Today, 12:49am

Savings Tip: Price difference between cheapest (177.9c/L) and most expensive (177.9c/L): 0.0c per litre. On a 50L tank, choosing the cheapest station saves you $0.00!

▸ Nearby Areas in SA

Compare fuel prices in these nearby locations:

▸ View Interactive Map & Live Prices for St Marys →

Other Suburbs in South Australia

Mount Gambier Port Augusta Port Lincoln Clare Coffin Bay Murray Bridge Waikerie Golden Grove Hawker Millicent Port Pirie Renmark Victor Harbor Whyalla

About Petrol Prices in St Marys

St Marys has 1 petrol stations. Right now, ULP (unleaded petrol) prices in St Marys range from 171.1c/L to 177.9c/L (a difference of 6.8c/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 174.5c/L (last updated: 12:49 AM, 30 Jan 2026).

How to Save Money on Fuel in St Marys

Compare before you fill: Use Petrolmate to find the cheapest stations - right now you can save up to 6.8c per litre in St Marys
Time it right: In South Australia, fill up early in the week (Monday-Wednesday) when prices are typically lower
Shop around suburbs: Prices can vary significantly between different areas
Consider alternative fuels: E10 is often cheaper than regular unleaded - check if your vehicle supports it
Use fuel discounts: Supermarket fuel vouchers (Woolworths, Coles) and BP rewards can save 4c or more per litre

🌏 Compare Petrol Prices in Other Cities

Find cheap fuel prices in other major cities across Australia and New Zealand:

Sydney, NSW Melbourne, VIC Brisbane, QLD Perth, WA Adelaide, SA Hobart, TAS Darwin, NT Canberra, ACT Auckland, NZ Wellington, NZ Christchurch, NZ