I have looked at the USED oil option and I am very interested. Perhaps I am not ready to make a $1500 commitment to run used veggie in my truck with fuel around $2 per gallon. But, as the cost of fuel goes up, so does the practicality of going this route. I have to wonder what the implications of not paying highway fuel tax are. You know the government will jump on this as soon as they figure it out.

How appealing does using used veggie oil become if fuel prices approach $3? $4?? $5??? or even more????