Energy Minister July Moyo said the government is running the tests with privately owned Green Fuel Ltd. as it seeks relief from higher fuel prices.
The trial extends Zimbabwe's biofuel programme beyond petrol, which is already blended with ethanol, and could help reduce diesel import costs if adopted.
Officials linked the move to fuel market pressure from conflict in the Middle East, highlighting efforts to shield the economy from external energy shocks.
Is Zimbabwe's plan to lower fuel costs enriching a monopoly at the public's expense?
Is Zimbabwe's biofuel trial a detour from more viable green energy solutions like solar power?
Will Zimbabwe's ethanol fuel plan leave owners of older vehicles with costly engine repair bills?