Litres in store, litres burned
As of August 2026 the national reserve held about 3.3 billion litres of diesel, enough to cover 36 days. This year's federal budget set out a National Fuel Security Plan worth 11.9 billion dollars and earmarked 3.2 billion dollars of it for physically stockpiling diesel and jet fuel, with the aim of lifting cover to 50 days. The one electrification line inside the plan is 40 million dollars for Australia Post's delivery fleet.[1]
Days of cover is a ratio more than a volume: litres in store divided by litres burned each day. Buying fuel raises the numerator, and 3.2 billion dollars is a serious amount of buying. Nothing of comparable size in the plan touches the denominator, and the denominator is what also sets the fuel bill. Per person, Australians use almost twice as much diesel as the US, so that denominator is unusually thick here.[1]
The burning is also concentrated. Articulated trucks are just over 3 per cent of the freight task and consume about a third of the diesel used across the sector. A report ARENA commissioned found that 98 per cent of transport operators are small and medium enterprises, that their median profit margin is 2 per cent, and that 70 per cent of them run a single truck. About 1 per cent of the national fleet is electric, and the average truck is 15 years old.[1]
What a kilometre costs on each fuel
Energy analyst David Leitch puts a B-double at roughly 1 dollar a kilometre on diesel against 30 cents on electricity, and calculates that one covering 100,000 km a year would save up to 73,000 dollars, with the extra purchase price recouped within three to four years. Climate Council analyst Ben McLeod says a package worth 3 billion dollars over five years could support 30,000 to 50,000 electric trucks, displace more than 1 billion litres of diesel a year, and cut operating costs by over 30,000 dollars a truck.[1]
Put the two figures side by side and the plan's shape looks like a choice of instrument more than a choice of arithmetic. Storage insures against supply that stops arriving; it does nothing about the litres that go on being burned. Cutting the burn does both, lowering the bill and lengthening the cover from the other end. But it needs the operators to move, and 70 per cent of them run one truck on a 2 per cent margin, which puts a 30,000 dollar annual saving out of reach of a business that cannot fund the purchase. There is a fair reading against this: a national reserve is held for an interruption rather than for a price, in which case the two measures answer different questions and comparing their budgets means comparing an insurance premium with an efficiency investment.[1]
Fleet turnover sets the clock either way. With an average truck life of 15 years and about 1 per cent of the fleet electric, the diesel burned a decade from now is largely being decided by the trucks bought this year. China shows the other speed: sales of heavy electric trucks went from near zero to 230,000 in 2025 and now account for more than a quarter of truck sales there.[1]
A buffer in weeks against a gap in years
This column argued on 11 August, in Eigen Radar, that the August short-term energy outlook had turned the Strait of Hormuz outage from a price event into a dated supply balance, with the missing volume expected to stay absent well beyond this year. That reading is what makes the days-of-cover figure worth staring at. A reserve built at 36 days and heading for 50 sets a buffer measured in weeks against a shortfall the same forecasters date in years. The report describes the war in Iran as the largest supply disruption in the history of the global oil market.[1], [2]
If the 3.2 billion dollars is spent on stockpiling as budgeted and no comparable electrification measure is added, the reserve should be reported at or close to 50 days of cover before the end of 2027, while electric trucks stay near the 1 per cent of the national fleet they hold now. Those two numbers, reported side by side, will be the readable test of whether the plan bought security or bought fuel.[1]