I have the panel ones with the "fake" bulb that connects with car and they work fine 0_o
Not sure if your talking about those tho
Also, what is the point on 89 oct? Would it be better? I tried it l last fill up and the performance and mpg was similar. I'm running 91 shell for a tank cause I'm going to be driving a long distance so I need the higher level. and it is suppose to "clean out the gunk"
not sure if that is a marketing scheme our not