E10 vs 91: is E10 worth it?

No, at the national averages on 30 Oct: E10 averages 236.0c, 4.9c under U91 (240.9c). E10 needs to be 7.0c under to make up for holding about 3% less energy, so U91 costs less per km.

E10 under U91, national
4.9c
gap E10 needs
7.0c
less energy per litre
3%
What to compare
What to compare
Comparison
U91 and E10 prices
Your car
Fills in its official fuel use. Or type your own figure below.
Starts at a medium car. Use your trip computer or last fill.
Assumed 3%: a litre of E10 holds about 3% less energy than U91. Change it if your own fills show a different figure.

Example: Australia averages in a medium car

Example

U91 is cheaper to run

$0.17 less

per 100 km: U91 $19.27, E10 $19.45. $26.16 a year over 15,000 km.

U91 at 240.9 c/L × 8.0 L/100km
$19.27
E10 fuel use (+3%)
8.24 L/100km
E10 at 236.0 c/L × 8.24 L/100km
$19.45
E10 price that matches U91E10 needs to be 7.0c under U91; it is 4.9c under.
233.9 c/L
  • U91$2,890.50/yrCheaper to run
  • E10$2,917.50/yr
Use E10 only if your car accepts it; check the fuel flap or handbook.

Example: Australia averages in a medium car. U91 is cheaper to run. $0.17 less. per 100 km: U91 $19.27, E10 $19.45. $26.16 a year over 15,000 km.

U91 is cheaper to run · U91 $19.27 · E10 $19.45$0.17/100 km

Details

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Is E10 worth it in your capital?

2 of the 6 capitals with both prices have E10 far enough under U91 to cost less per km. The bar is E10’s discount; the line is the discount it needs.

  1. Hobart

    E10 cheaper to run

    E10 averages 234.6c, 10.4c under U91 (245.0c). It needs to be 7.1c under to make up for its lower energy, so E10 costs less per km. Updated .

  2. Adelaide

    E10 cheaper to run

    E10 averages 219.9c, 7.4c under U91 (227.3c). It needs to be 6.6c under to make up for its lower energy, so E10 costs less per km. Updated .

  3. Melbourne

    U91 cheaper to run

    E10 averages 233.9c, 5.5c under U91 (239.4c). It needs to be 7.0c under to make up for its lower energy, so U91 still costs less per km. Updated .

  4. Brisbane

    U91 cheaper to run

    E10 averages 233.7c, 2.7c under U91 (236.4c). It needs to be 6.9c under to make up for its lower energy, so U91 still costs less per km. Updated .

  5. Canberra

    U91 cheaper to run

    E10 averages 242.9c, 2.6c under U91 (245.5c). It needs to be 7.2c under to make up for its lower energy, so U91 still costs less per km. Updated .

  6. Sydney

    U91 cheaper to run

    E10 averages 235.0c, 1.8c under U91 (236.8c). It needs to be 6.9c under to make up for its lower energy, so U91 still costs less per km. Updated .

Each capital’s current averages, for a car using 8 L/100km of U91 and 3% more of E10.

How to check E10 for your car

  1. Compare the two prices

    Use current U91 and E10 prices from the same station or the same city average.

  2. Allow for the energy difference

    A litre of E10 holds about 3% less energy than U91, so a car uses about 3% more of it for the same distance.

  3. Find the break-even price

    Divide the U91 price by 1.03. E10 costs less to run only when its price is below that figure.

  4. Check your car first

    Use E10 only if the fuel filler flap, handbook or manufacturer says the car accepts it.

E10 prices

Find E10 far enough under U91

Nationally E10 needs to be 7.0c under U91. Compare E10 at stations near you before you fill.

See E10 prices

E10 vs 91 questions

Is E10 worth it?

Only when it is cheap enough. E10 averages 236.0c, 4.9c under U91. It holds about 3% less energy, so it needs to be 7.0c cheaper to cost less per km. At the national averages, U91 costs less to run: $26 a year over 15,000 km in a car using 8 L/100km.

Why does E10 use more fuel?

E10 is 10% ethanol, which carries about two-thirds of petrol's energy per litre, so a litre of E10 holds about 3% less energy than a litre of U91. A car needs about 3% more litres of E10 to drive the same distance, though the difference varies by engine and driving.

Is E10 cheaper to run in every capital?

No. At current averages E10 costs less per km in Hobart, Adelaide, and U91 costs less in Melbourne, Brisbane, Canberra, Sydney.

Can my car use E10?

Check the fuel filler flap, the owner’s handbook or the manufacturer before using E10. Most recent petrol cars accept it, but some older cars, small engines and boats should not use it.

Fuel map

Check a station price before you go

Open the fuel map for reported prices, update times and directions near you or along your route.