The problem is the tanks are seldom empty when they drop in another batch
this is the reason that I prefer to mix my own.
Test it.. it tells you the ethanol content..the
rest is filler.... its not difficult... it tells
you the ethanol level.. thats ALL your concerned
with.. like I said already.. its gonna be mixed
with 87 octane ... with the test it shows what
ethanol level it is.... PERIOD..if the ethanol
show low dont buy it...the place I buy it from
was ALWAYS 85-86 percent ethanol..but I ONLY bought
in the summer.. they have a date that they call the
change over but how low will that fuel be in there..
so I waited a month at least...I tested this stuff at
work all the time.. it was my job in the fuel lab
EDIT
the only differences in the mix is the 87 octane
that they mix with(filler) is the additives they
add.. in summer its very close... winter its a bit
higher in RVP(Reid Vapor Pressure)... summer is lower
