At 02:08 AM 2/6/2012, Don wrote:
>According to the Suncor engineer, gas stations have two tanks,
>regular and premium. Mid grade is mixed at the pump.

Yes, it wouldn't make sense for them to go to the huge expense of a
separate tank for midgrades,  at the station and in the tanker and at
the tank farm.  Just put in an adjustable proportioning valve inside the pump.

Yours,
David