▁use ▁with ▁up ▁to ▁that ▁level ▁of ▁partial ▁b iod ies el ; ▁experiments ▁with ▁ 5 0 % ▁b iod ies el ▁are ▁under way . ▁During ▁the ▁same ▁period , ▁nations ▁in ▁other ▁parts ▁of ▁the ▁world ▁also ▁saw ▁local ▁production ▁of ▁b iod ies el ▁starting ▁up : ▁by ▁ 1 9 9 8 , ▁the ▁Aust rian ▁Bio fu els ▁Institute ▁had ▁identified ▁ 2 1 ▁countries ▁with ▁commercial ▁b iod ies el ▁projects . ▁ 1 0 0 % ▁b iod ies el ▁is ▁now ▁available ▁at ▁many ▁normal ▁service ▁stations ▁across ▁Europe . ▁ ▁Properties ▁B iod ies el ▁has ▁prom ising ▁lub ric ating ▁properties ▁and ▁cet ane ▁ratings ▁compared ▁to ▁low ▁sul fur ▁dies el ▁fu els . ▁Fu els ▁with ▁higher ▁lub ric ity ▁may ▁increase ▁the ▁us able ▁life ▁of ▁high - press ure ▁fuel ▁injection ▁equipment ▁that ▁re lies ▁on ▁the ▁fuel ▁for ▁its ▁lub ric ation . ▁Depending ▁on ▁the ▁engine , ▁this ▁might ▁include ▁high ▁pressure ▁injection ▁p umps , ▁p ump ▁inject ors ▁( also ▁called ▁unit ▁inject ors ) ▁and ▁fuel ▁inject ors . ▁ ▁The ▁cal or ific ▁value ▁of ▁b iod ies el ▁is ▁about ▁ 3 7 . 2 7 ▁M J / kg . ▁This ▁is ▁ 9 % ▁lower ▁than ▁regular ▁Number ▁ 2 ▁pet rod ies el . ▁Vari ations ▁in ▁b iod ies el ▁energy ▁density ▁is ▁more ▁dependent ▁on ▁the ▁feed stock ▁used ▁than ▁the ▁production ▁process . ▁Still ,