ive used E10 from shell, the car ran fine and no problems, no rebuild light, no bang bang, no checker plate falling out, no danger to manifold light. i think from memory i backed out a few deg of timing (mine has aggressive tune) so no noticable issues etc
i can try it again if someone wants me to
i need to fill up and E10 is local to me
do u want me to fill out with std ign maps (as is) in summer tune and let you know how much i get?