Quantity of bio fuel from a gallon of used vegetable oil?

When you use a gallon of used vegetable oil, how much bio fuel is created? What is ratio on conversion? Sorry if it seems a simple question. I have very little knowledge on subject.

the ratio is 1 to 1. sometimes if a lot of water, is in the oil, you might get an intermix layer, that can be processed separately, other than that you should get 1 for 1.

Harpman

Tony Rupp wrote:When you use a gallon of used vegetable oil, how much bio fuel is created? What is ratio on conversion?

Hi Tony,

In my experience...it depends.

With Waste Vegetable Oil (WVO) collected from restaurants there's usually about a 10% loss through dewatering and settling to remove the particles of flour and fried bits prior to making biodiesel. If you get very clean and dry oil, this loss can be mush less.

It also depends on how degraded the oil is. When oil degrades, free fatty acids (FFAs) are created that depending on the process you use, may turn into soaps rather than biodiesel. WVO from restaurants is typically about 3% FFAs and are lost to most homebrewers.

The short answer is that for most homebrewers, 1 gallon of collected oil turns into about 0.85 gallons of finished fuel - plus or minus 10%.