In joules, please

I made two batches of biodiesel, one with waste vegetable oil and the other with clean. The one with waste veggie oil turned out to be really potent and had a high energy content while the one with clean veggie oil didn’t even burn when lighted. I was wondering what makes the waste vegetable oil a better component of biodiesel than clean? Does it have something to do with the transesterification process?
Also, does anyone know the chemical formulas for biodiesel with waste vegetable oil and biodiesel with clean vegetable oil?

I know abot lipase, but I need researchings and yieldings about enzymatic transesterification

i wanted to see if theres was anything cool i could make out of the glycerin, like soap or something. thanks

My job is pretty unreliable so i cant really afford to fill my car with Diesel.
Can anyone answer any of my questions to do with this topic
Is biodiesel or vegetable oil a cheaper alternative?
Can i run my car legally on any of these, do i have to inform anyone?
Are there any damaging effects on my Car?
Is it cheaper than regular Diesel?
And where can i buy diesel/veggie oil?
Thanks if anyone can help

Describe at least two advantages and two disadvantages of having a biodiesel power plant in your town?

We made Biodiesel from vegetable oil and I wanna know how to easily test it at home to know how much carbon it is emitting and how much carbon is reduced via percentage.

p.s and i don’t want to use a car or an engine

I need to provide a recipe for making biodiesel for my organic chemistry class. I need to make 500 mL of biodiesel from waste cooking oil, and one of the processes should include a titration. Does anyone know how to do this?