The amount of diesel cleared by Revenue fell in July, according to the latest figures from the Central Statistics Office.
In a release, the CSO said the lower level of clearances "may be due to consumers cutting back on buying fuel due to rising prices".
A total of 296 million litres of autodiesel were cleared in July, which was 5% lower than July 2021. It matched the figure for July 2020, during the Covid pandemic.
This is a departure from a long-term trend of increasing autodiesel volumes.
Today's CSO figures show that 81 million litres of petrol were cleared in July, which was 3% lower than July last year and 13% lower than 2019.
Clearances of kerosene, which is used for home heating, were 1% lower than July 2021.