I have a 99 powder special and have been running ethanol fuel (10%) thru it. I want to change over to 100% gas (87 octane). If I remember correctly, I have the wire unplugged now. Could I run the tank near empty and fill it with 87 octane and leave the wire unplugged until that tank is near empty? Having it unplugged causes it to use more oil right? I would rather use a little more oil for a tank full rather than burn the motor down.