Used Vegetable oil

I own a Restaurant in Rhode Island I fill my container with an avg of 15-20 gallons a night. It's 100% creamy liquid shorting. My guy is give me .75 a gallon i have a feeling i'm getting ripped off he say's hes donating it to the shelter for home heating oil. But I heard his son the other night saying the father get $3.50 a gallon and sells it for bio-diseal. I'm thinking about just watering it down on him and suggestions thanks

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