▁these ▁variations ▁are ▁less ▁than ▁for ▁pet rod ies el . ▁It ▁has ▁been ▁claimed ▁b iod ies el ▁gives ▁better ▁lub ric ity ▁and ▁more ▁complete ▁comb ust ion ▁thus ▁increasing ▁the ▁engine ▁energy ▁output ▁and ▁partially ▁compens ating ▁for ▁the ▁higher ▁energy ▁density ▁of ▁pet rod ies el . ▁ ▁The ▁color ▁of ▁b iod ies el ▁ranges ▁from ▁golden ▁to ▁dark ▁brown , ▁depending ▁on ▁the ▁production ▁method . ▁It ▁is ▁slightly ▁mis cible ▁with ▁water , ▁has ▁a ▁high ▁bo iling ▁point ▁and ▁low ▁v apor ▁pressure . ▁The ▁flash ▁point ▁of ▁b iod ies el ▁exceed s ▁, ▁significantly ▁higher ▁than ▁that ▁of ▁pet role um ▁dies el ▁which ▁may ▁be ▁as ▁low ▁as ▁. ▁B iod ies el ▁has ▁a ▁density ▁of ▁~ 0 . 8 8   g / cm ³ , ▁higher ▁than ▁pet rod ies el ▁( ~ 0 . 8 5   g / cm ³ ). ▁ ▁B iod ies el ▁contains ▁virt ually ▁no ▁sul fur , ▁and ▁it ▁is ▁often ▁used ▁as ▁an ▁add itive ▁to ▁ult ra - low - s ulf ur ▁dies el ▁( UL SD ) ▁fuel ▁to ▁aid ▁with ▁lub ric ation , ▁as ▁the ▁sul fur ▁comp ounds ▁in ▁pet rod ies el ▁provide ▁much ▁of ▁the ▁lub ric ity . ▁ ▁F uel ▁efficiency ▁The ▁power ▁output ▁of ▁b iod ies el ▁depends ▁on ▁its ▁bl end , ▁quality , ▁and ▁load ▁conditions ▁under ▁which ▁the ▁fuel ▁is ▁bur nt . ▁The ▁thermal