Lectures No More

THESE past three years Tatang Hernas Soerawidjaja no longer carries around jerry cans on the back of his car. Since Pertamina started selling biodiesel with the trade name bio-solar (B5) at several gas stations, he stopped mixing diesel with biodiesel liquids. Neither does he need to give on-the-spot “lectures” to anyone who needs to know how to mix biodiesel liquids.

In the past, said Tatang, gas station employees always asked him what liq

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