I've been considering starting to use Star Tron concentrate formula for the E10 87oct. gas I run universally. My fleet is all pre-1995 vehicles. I'd buy the E0 that has recently become available at Wawa around here, but it's only available in 89 octane which I don't need, and it costs $.60 to $.90 more than 87 E10 regular. A lot of my less used truck's gas sits for 3-6 months in the tank before refills. I can get the Strar Tron concentrate for about $30 that treats 512 gallons. Would it be a good idea to use it as a preventative measure to prevent phase separation(assuming it does as it claims), or would there be no tangible benefit? The threads I've read seem to suggest people are split on it's efficacy.