Question 1

Is E10 really cheaper than U91 to run?

Accepted Answer

E10 is usually 2–3c/L cheaper at the pump but consumes 2–4% more fuel per kilometre. On most modern petrol cars E10 still wins narrowly. But the saving disappears if you drive an older car designed for U91 only.

Question 2

Should I switch from petrol to diesel?

Accepted Answer

Only if you drive a lot of long-distance kilometres. Diesel cars cost more to buy and service, but they typically use 20–30% less fuel and diesel does not follow the same weekly cycle as petrol, making fuel costs more predictable.

Question 3

What economy figure should I use?

Accepted Answer

Look up the official ADR81/02 combined cycle figure (NCAP rating sticker or owner's manual). For older cars or specific driving styles, take a few honest tank measurements (km driven divided by litres filled) for a realistic number.

Question 4

Why are LPG cars rare now?

Accepted Answer

LPG-converted cars used to save big money on running costs, but the federal LPG vehicle scheme ended in 2014 and station coverage has shrunk year on year. Most existing LPG drivers still save vs petrol, but new conversions rarely pay back.

Fuel Type Cost Comparison

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