Dear Tamilselvan

Please refer the link. It gives more information about bio fuels

http://www.biodieseltechnologiesindia.com/recent.html

jatropha is the cost effective bio diesel, which source is easily available in india

I think so Jatopha is abundant available bio- fuel crop in India

Straight vegetable oil (SVO) – It is the unrefined and non-processed oil directly extracted from oil seeds. SVO produced by oil expellers across the country is cheap, whose market price depends on the oilseed and transportation costs. However, this fuel cannot be used directly; it needs to be blended in minor quantities with petro-diesel. The typical mixing ratio would be 80% petro-diesel and 20% SVO (B20 blend) or 90:10 ratio (B10 blend).

SVO is mainly extracted from non-edible oil trees such as Neem, Mahua [Madhuca longifolia], Karanja [Pongamia pinnata], Jatropha [Jatropha curcas], Simarouba [Simarouba glauca], etc., which grow abundantly across the countryside. There are about 20 other plant species like palm, rapeseed, sunflower, soya whose edible oil seeds also yield acceptable Biodiesel.

we are using the oil which is directly got from the  mess an house holds

and in my opinion it is the most effective one

The cost effective bio diesel is using jatropha seed and on the basis of emissions corn ethanol is preferable